111111
`
`1111111111111111111111111111111111111111111111111111111111111
`US009254240B2
`
`c12) United States Patent
`Lin et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 9,254,240 B2
`Feb.9,2016
`
`(54)
`
`INFLATABLE SPA
`
`(71) Applicant: Intex Recreation Corp., Long Beach,
`CA (US)
`
`(72)
`
`Inventors: Hua Hsiang Lin, Fujian (CN); Yaw
`Yuan Hsu, Fujian (CN)
`
`(73) Assignee: Intex Recreation Corp., Long Beach,
`CA (US)
`
`( *) Notice:
`
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 0 days.
`
`(51)
`
`Int. Cl.
`A47K3/06
`A61H 33102
`
`(2006.01)
`(2006.01)
`(Continued)
`
`(52) U.S. Cl.
`CPC A61H 33102 (2013.01); A47K 3106 (2013.01);
`A61H 3310087 (2013.01);
`(Continued)
`
`(58) Field of Classification Search
`CPC ........................................................ A47K 3/06
`USPC ...................................................... 4/538-595
`See application file for complete search history.
`
`(21) Appl. No.: 14/444,474
`
`(22) Filed:
`
`Jul. 28, 2014
`
`(65)
`
`Prior Publication Data
`
`US 2015/0020306 AI
`
`Jan.22,2015
`
`Related U.S. Application Data
`
`(63) Continuation of application No. PCTIUS2014/
`047252, filed on Jul. 18, 2014.
`
`CH
`CH
`
`(30)
`
`Foreign Application Priority Data
`
`(56)
`
`References Cited
`
`U.S. PATENT DOCUMENTS
`
`573,122 A
`818,321 A
`
`12/1896 Young
`4/1906 Whall
`(Continued)
`
`FOREIGN PATENT DOCUMENTS
`
`4/1938
`197243
`6/1967
`438622
`(Continued)
`
`OTHER PUBLICATIONS
`
`Intex, PureSpa SSP-10 Owner's Manual, dated Apr. 18, 2013, 17
`pages.
`
`(Continued)
`
`Primary Examiner- Lori Baker
`(74) Attorney, Agent, or Firm- Faegre Baker Daniels LLP
`
`ABSTRACT
`(57)
`An inflatable spa having improved strength includes a water
`cavity that receives massaging air bubbles and/or jetted water.
`
`30 Claims, 37 Drawing Sheets
`
`Jul. 18, 2013
`Nov. 21, 2013
`Nov. 21, 2013
`Nov. 21, 2013
`Nov. 21, 2013
`Dec. 5, 2013
`Dec.30,2013
`Dec.30,2013
`Dec.30,2013
`Jan. 15, 2014
`Jan. 15, 2014
`Jan. 15, 2014
`Jan.26,2014
`Jul. 8, 2014
`
`(CN) ...................... 2013 2 0428910 U
`(CN) ...................... 2013 2 0745798 U
`(CN) ...................... 2013 2 0745863 U
`(CN) ...................... 2013 2 0745887 U
`(CN) ...................... 2013 2 0746974 U
`(CN) ...................... 2013 2 0796506 U
`(CN) ...................... 2013 2 0888403 U
`(CN) ...................... 2013 2 0888639 U
`(CN) ...................... 2013 2 0892855 U
`(CN) .......................... 2014 1 0017358
`(CN) ...................... 2014 2 0023673 U
`(CN) ...................... 2014 2 0023673 U
`(CN) ...................... 2014 2 0050705 U
`(CN) ...................... 2014 2 0375437 U
`
`110
`
`Bestway Exhibit 1001-0001
`PGR2017-00003
`
`

`
`US 9,254,240 B2
`Page 2
`
`(51)
`
`(2006.01)
`(2006.01)
`(2006.01)
`
`Int. Cl.
`A61H 33100
`E04H 4112
`E04H 4100
`(52) U.S. Cl.
`CPC ....... A61H 3316021 (2013.01); A61H 3316068
`(2013.01); E04H 410025 (2013.01); E04H
`41129 (2013.01); A61H 2033/023 (2013.01);
`A61H 2201/0103 (2013.01)
`
`(56)
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`
`CH
`CN
`CN
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`CN
`CN
`CN
`CN
`CN
`CN
`CN
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`JP
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`wo
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`438 622
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`2074591
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`2361179
`1280467
`1124804
`1506140
`2659261
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`412005
`
`Bestway Exhibit 1001-0002
`PGR2017-00003
`
`

`
`US 9,254,240 B2
`Page 3
`
`(56)
`
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`
`Bestway Exhibit 1001-0003
`PGR2017-00003
`
`

`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 1 of 37
`
`US 9,254,240 B2
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`100
`I
`
`108
`
`104
`
`110
`
`FIG. 1
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`Bestway Exhibit 1001-0004
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`U.S. Patent
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`Feb.9,2016
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`Sheet 2 of 37
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`US 9,254,240 B2
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`100
`I
`
`FIG. 2
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`Bestway Exhibit 1001-0005
`PGR2017-00003
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`U.S. Patent
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`Feb.9,2016
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`Sheet 3 of 37
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`US 9,254,240 B2
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`100
`I
`
`110
`
`112
`
`FIG. 3
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`Bestway Exhibit 1001-0006
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`U.S. Patent
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`Feb.9,2016
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`Sheet 4 of 37
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`US 9,254,240 B2
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`120
`(
`
`152a,156a
`
`138
`
`172
`
`I
`I
`I
`
`142,144, 146-.... :
`
`FIG. 4
`
`Bestway Exhibit 1001-0007
`PGR2017-00003
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`U.S. Patent
`
`Feb.9,2016
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`Sheet 5 of 37
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`US 9,254,240 B2
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`120
`I
`
`132
`
`120
`I
`
`FIG. 5
`
`FIG. 6
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`Bestway Exhibit 1001-0008
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`U.S. Patent
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`Feb.9,2016
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`Sheet 6 of 37
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`US 9,254,240 B2
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`108
`I
`152c, 156c
`
`120
`
`152a,156a
`7
`106
`
`FIG. 7
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`
`152a,156a
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`FIG. 8
`
`Bestway Exhibit 1001-0009
`PGR2017-00003
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`U.S. Patent
`
`Feb.9,2016
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`Sheet 7 of 37
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`US 9,254,240 B2
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`FIG. 9
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`Bestway Exhibit 1001-0010
`PGR2017-00003
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`U.S. Patent
`
`Feb.9,2016
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`Sheet 8 of 37
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`US 9,254,240 B2
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`202
`
`F\G. 10
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`Bestway Exhibit 1001-0011
`PGR2017-00003
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`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 9 of37
`
`US 9,254,240 B2
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`F\G. 11
`
`Bestway Exhibit 1001-0012
`PGR2017-00003
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`U.S. Patent
`
`Feb.9,2016
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`Sheet 10 of 37
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`US 9,254,240 B2
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`200
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`F\G. 12
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`Bestway Exhibit 1001-0013
`PGR2017-00003
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`U.S. Patent
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`Feb.9,2016
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`Sheet 11 of 37
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`US 9,254,240 B2
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`206
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`200
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`
`202
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`FIG. 13
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`Bestway Exhibit 1001-0014
`PGR2017-00003
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`U.S. Patent
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`Feb.9,2016
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`Sheet 12 of 37
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`US 9,254,240 B2
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`U.S. Patent
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`Feb.9,2016
`
`Sheet 13 of 37
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`US 9,254,240 B2
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`Bestway Exhibit 1001-0016
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`U.S. Patent
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`Feb.9,2016
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`Sheet 14 of 37
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`Bestway Exhibit 1001-0017
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`U.S. Patent
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`Feb.9,2016
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`Sheet 16 of 37
`
`US 9,254,240 B2
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`Bestway Exhibit 1001-0019
`PGR2017-00003
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`U.S. Patent
`
`Feb.9,2016
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`Sheet 17 of 37
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`US 9,254,240 B2
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`312
`
`310
`I
`
`244
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`FIG. 19
`
`Bestway Exhibit 1001-0020
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`U.S. Patent
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`Feb.9,2016
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`Sheet 18 of 37
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`U.S. Patent
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`Feb.9,2016
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`Sheet 19 of 37
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`US 9,254,240 B2
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`Feb.9,2016
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`Sheet 20 of 37
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`U.S. Patent
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`Feb.9,2016
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`Sheet 21 of 37
`
`US 9,254,240 B2
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`106
`
`102
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`FIG. 23
`
`Bestway Exhibit 1001-0024
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`U.S. Patent
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`Feb.9,2016
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`Sheet 22 of 37
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`112
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`Feb.9,2016
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`Sheet 24 of 37
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`US 9,254,240 B2
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`226
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`FIG. 26
`
`Bestway Exhibit 1001-0027
`PGR2017-00003
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`

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`U.S. Patent
`
`Feb.9,2016
`
`Sheet 25 of 37
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`US 9,254,240 B2
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`534
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`500
`FIG. 27
`
`Bestway Exhibit 1001-0028
`PGR2017-00003
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`

`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 26 of 37
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`US 9,254,240 B2
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`FIG. 28
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`Bestway Exhibit 1001-0029
`PGR2017-00003
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`

`
`U.S. Patent
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`Feb.9,2016
`
`Sheet 27 of 37
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`US 9,254,240 B2
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`FIG. 29
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`Bestway Exhibit 1001-0030
`PGR2017-00003
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`

`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 28 of 37
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`US 9,254,240 B2
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`548
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`FIG. 30
`
`Bestway Exhibit 1001-0031
`PGR2017-00003
`
`

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`Bestway Exhibit 1001-0032
`PGR2017-00003
`
`

`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 30 of 37
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`US 9,254,240 B2
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`FIG. 32
`
`FIG. 33
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`Bestway Exhibit 1001-0033
`PGR2017-00003
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`

`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 31 of 37
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`US 9,254,240 B2
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`646
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`FIG. 34
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`FIG. 35
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`Bestway Exhibit 1001-0034
`PGR2017-00003
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`U.S. Patent
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`Feb.9,2016
`
`Sheet 33 of 37
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`US 9,254,240 B2
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`740
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`FIG. 37
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`Bestway Exhibit 1001-0036
`PGR2017-00003
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`

`
`U.S. Patent
`
`Feb. 9, 2016
`
`Sheet 34 of 37
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`US 9,254,240 B2
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`772
`
`FIG. 39
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`Bestway Exhibit 1001-0037
`PGR2017-00003
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`

`
`U.S. Patent
`
`Feb.9,2016
`
`Sheet 35 of 37
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`US 9,254,240 B2
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`PGR2017-00003
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`
`U.S. Patent
`
`Feb.9,2016
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`Sheet 36 of 37
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`US 9,254,240 B2
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`110 762
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`FIG. 41
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`770
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`Bestway Exhibit 1001-0039
`PGR2017-00003
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`

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`U.S. Patent
`
`Feb.9,2016
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`Sheet 37 of 37
`
`US 9,254,240 B2
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`766
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`762
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`768
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`FIG. 42
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`Bestway Exhibit 1001-0040
`PGR2017-00003
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`

`
`US 9,254,240 B2
`
`1
`INFLATABLE SPA
`
`CROSS REFERENCE TO RELATED
`APPLICATIONS
`
`This application is a continuation of PCT/US14/47252,
`filed Jul. 18, 2014, entitled "INFLATABLE SPA," the disclo(cid:173)
`sure of which is hereby expressly incorporated by reference
`herein in its entirety. This application also claims priority to
`the following Chinese patent applications under 35 U.S.C.
`§ 119(b ), the disclosures of which are hereby expressly incor(cid:173)
`porated by reference herein in their entirety:
`
`2
`porous sheet including a plurality of enclosed pores located
`entirely within the outer perimeter of the at least one attach(cid:173)
`ment sheet.
`In certain embodiments, the porous sheet includes a plu(cid:173)
`rality of frame members that intersect to define the plurality of
`enclosed pores.
`In certain embodiments, the plurality of frame members of
`the porous sheet are interwoven.
`In certain embodiments, the plurality of frame members of
`10 the porous sheet are arranged in a grid pattern.
`In certain embodiments, the porous sheet includes a plu(cid:173)
`rality of open spaces that are partially surrounded by the
`frame members.
`In certain embodiments, the at least one attachment sheet
`15 has a lower melting point than the porous sheet.
`In certain embodiments, the at least one attachment sheet,
`the first wall, and the second wall have similar melting points.
`In certain embodiments, the porous sheet includes a second
`plurality of enclosed pores located beyond the outer perim-
`20 eter of the at least one attachment sheet.
`In certain embodiments, the porous sheet has an outer
`perimeter that substantially overlaps the outer perimeter of
`the at least one attachment sheet.
`In certain embodiments, the product is a spa. In other
`25 embodiments, the product is a mattress. In other embodi(cid:173)
`ments, the product is a pool.
`In certain embodiments, the first wall is an internal wall of
`the spa, and the second wall is an external wall of the spa, the
`spa further including a bottom wall that cooperates with the
`30 internal wall to define a water cavity.
`In certain embodiments, the spa includes a water cavity, the
`product further including a heating unit in fluid communica(cid:173)
`tion with the water cavity, the heating unit including a heating
`element and a U-shaped water cavity around the heating
`35 element.
`In certain embodiments, the product further includes a
`control system with a controller that maintains a current of the
`control system below a predetermined level by limiting a
`Inflatable spas are generally constructed of material having
`power supply to the heating unit.
`high flexibility and low rigidity. Although such inflatable spas 40
`According to still yet another embodiment of the present
`disclosure, an inflatable product is provided including a first
`are generally more affordable than permanent spas, inflatable
`wall, a second wall, an inflatable air chamber defined by the
`spas generally lack the strength, comfort, clean appearance,
`first wall and the second wall, and a plurality of tensioning
`and useful life of permanent spas. Also, inflatable spas may be
`structures located in the air chamber. Each tensioning struc-
`difficult to assemble, disassemble, store, and transport.
`45 ture is coupled to the first wall along a first seam that extends
`The present disclosure relates to an inflatable spa having
`along a first line and to the second wall along a second seam
`improved strength. A water cavity of the inflatable spa may
`that extends along a second line. Each tensioning structure
`receive massaging air bubbles and/or jetted water.
`includes a porous sheet with a plurality of pores, wherein any
`According to an embodiment of the present disclosure, an
`line parallel to the first line intersects the plurality of pores in
`inflatable product is provided including a porous sheet
`50 the porous sheet.
`coupled to a wall of the inflatable product.
`In certain embodiments, the porous sheet includes a plu(cid:173)
`According to another embodiment of the present disclo(cid:173)
`rality of frame members that cooperate to define the plurality
`sure, an inflatable product is provided including a porous
`of pores, wherein the plurality of frame members are oriented
`sheet coupled to a wall of the inflatable product via an attach(cid:173)
`transverse to the first line.
`ment sheet.
`In certain embodiments, the plurality of frame members
`According to yet another embodiment of the present dis(cid:173)
`are oriented transverse to a third line that is perpendicular to
`closure, an inflatable product is provided including a porous
`the first line.
`tensioning structure in an air chamber of the inflatable prod-
`In certain embodiments, the first line is parallel to the
`uct.
`second line.
`According to still yet another embodiment of the present 60
`According to still yet another embodiment of the present
`disclosure, an inflatable product is provided including a first
`disclosure, an inflatable spa is provided including a top wall,
`wall, a second wall, an inflatable air chamber defined by the
`a bottom wall, an internal wall, an external wall, an inflatable
`first wall and the second wall, and a plurality of tensioning
`air chamber defined by the top wall, the bottom wall, the
`internal wall, and the external wall, a water cavity defined by
`structures located in the air chamber and coupled to the first
`wall and the second wall. Each tensioning structure includes 65 the bottom wall and the internal wall, and a control system
`at least one attachment sheet having an outer perimeter and a
`including an air pump operable in an inflation mode that
`supplies air to the air chamber to inflate the air chamber, a
`porous sheet coupled to the at least one attachment sheet, the
`
`Chinese
`Application Number
`
`2013-204289100
`2013-207457983
`2013-207458632
`2013-207458878
`2013-207469745
`2013-207965069
`2013-208884035
`2013-208886399
`2013-208928550
`2014-100173585
`2014-200236734
`2014-20050705X
`2014-203754379
`
`Filing Date
`
`Jul. 18, 2013
`Nov. 21, 2013
`Nov. 21, 2013
`Nov. 21, 2013
`Nov. 21, 2013
`Dec. 5, 2013
`Dec. 30, 2013
`Dec. 30, 2013
`Dec. 30, 2013
`Jan. 15, 2014
`Jan. 15, 2014
`Jan. 26, 2014
`Jul. 18, 2014
`
`FIELD OF THE DISCLOSURE
`
`The present disclosure relates to an inflatable spa. More
`particularly, the present disclosure relates to an inflatable spa
`having improved strength, and to a method for using the same.
`
`BACKGROUND AND SUMMARY
`
`55
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`Bestway Exhibit 1001-0041
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`US 9,254,240 B2
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`4
`plurality of pores in the porous sheet, attaching the second
`sheet to the third sheet, and placing the porous sheet in the air
`chamber of the inflatable product.
`In certain embodiments, the second sheet includes an
`attachment layer located between one of the plurality of walls
`of the inflatable product and the porous layer.
`In certain embodiments, the second sheet includes one of
`the plurality of walls of the inflatable product.
`In certain embodiments, the attaching step includes attach(cid:173)
`! o ing the second material of the second sheet to the third mate(cid:173)
`rial of the third sheet through the plurality of pores in the
`porous sheet.
`In certain embodiments, the attaching step includes melt(cid:173)
`ing the second material of the second sheet and the third
`15 material of the third sheet.
`In certain embodiments, the second material of the second
`sheet is the same as the third material of the third sheet.
`
`BRIEF DESCRIPTION OF THE DRAWINGS
`
`3
`deflation mode that removes air from the air chamber to
`deflate the air chamber, and an aeration mode that supplies air
`to the water cavity to aerate the water cavity.
`In certain embodiments, the spa further includes an air
`passageway between the air pump and the spa that extends
`above the water cavity of the spa.
`In certain embodiments, the control system further
`includes a control panel assembly that receives a user input,
`wherein the control panel assembly is mounted to the air
`passageway at a location above the water cavity of the spa.
`In certain embodiments, the air passageway includes a first
`check valve and a second check valve positioned in series to
`prevent a backflow of water from the water cavity of the spa
`to the air pump.
`In certain embodiments, at least one of the first check valve
`and the second check valve becomes progressively tighter as
`water pressure from the water cavity of the spa increases.
`According to still yet another embodiment of the present
`disclosure, an inflatable spa is provided including a top wall,
`a bottom wall, an internal wall, an external wall, an inflatable 20
`air chamber defined by the top wall, the bottom wall, the
`internal wall, and the external wall, a water cavity defined by
`the bottom wall and the internal wall, and a jetted water pipe
`network that delivers jetted water to the water cavity, wherein
`the jetted water pipe network is substantially concealed 25
`within the inflatable air chamber.
`In certain embodiments, the spa further includes a control
`system and a single water inlet pipe between the water cavity
`and the control system, wherein the water inlet pipe includes
`a filtered water inlet portion and a jetted water inlet portion. 30
`In certain embodiments, the control system includes a
`drain assembly having a filtered water drain passageway in
`fluid communication with the filtered water inlet portion of
`the water inlet pipe, a jetted water drain passageway in fluid
`communication with the jetted water inlet portion of the water
`inlet pipe, and an outlet in fluid communication with both the
`filtered water drain passageway and the jetted water drain
`passageway.
`In certain embodiments, the spa further includes a filtering
`cover that covers both the filtered water inlet portion and the 40
`jetted water inlet portion of the water inlet pipe.
`In certain embodiments, the jetted water pipe network
`includes a plurality of spray nozzles, a first connecting pipe
`that delivers water to the plurality of spray nozzles, and a
`second connecting pipe that delivers air to the plurality of 45
`spray nozzles, wherein the plurality of spray nozzles, the first
`connecting pipe, and the second connecting pipe are substan(cid:173)
`tially concealed within the inflatable air chamber.
`In certain embodiments, the first and second connecting
`pipes are flexible.
`In certain embodiments, the plurality of spray nozzles are
`spaced apart annularly about the internal wall of the spa.
`According to still yet another embodiment of the present
`disclosure, a method is provided for erecting an inflatable spa
`having an inflatable air chamber and a water cavity. The
`method includes inflating the air chamber of the inflatable spa
`to a pressure greater than about 0.8 psi. In certain embodi(cid:173)
`ments, the pressure is about 1.5 psi.
`According to still yet another embodiment of the present
`disclosure, a method is provided for manufacturing an inflat(cid:173)
`able product having an air chamber defined by a plurality of
`walls. The method includes providing a porous sheet of a first
`material, at least a portion of the first material surrounding a
`plurality of pores in the porous sheet, placing the porous sheet
`between a second sheet of a second material and a third sheet
`of a third material, the second material and the third material
`covering the portion of the first material that surrounds the
`
`The above-mentioned and other features and advantages of
`this disclosure, and the manner of attaining them, will
`become more apparent and the invention itself will be better
`understood by reference to the following description of
`embodiments of the invention taken in conjunction with the
`accompanying drawings, wherein:
`FIG. 1 is an exploded perspective view of an exemplary
`inflatable spa of the present disclosure, the inflatable spa
`including a plurality of tensioning structures;
`FIG. 2 is a top cross-sectional view of the inflatable spa of
`FIG.1;
`FIG. 3 is a side cross-sectional view of the inflatable spa of
`FIG.1;
`FIG. 4 is an elevational view of the tensioning structure of
`35 FIG. 1;
`FIG. 5 is an exploded perspective view of the tensioning
`structure including a porous layer and two attachment layers;
`FIG. 6 is an exploded perspective view of the tensioning
`structure including a porous layer and an attachment layer;
`FIG. 7 is a top cross-sectional view of the tensioning struc(cid:173)
`ture coupled directly to the inflatable spa;
`FIG. 8 is a top cross-sectional view of the tensioning struc(cid:173)
`ture coupled indirectly to the inflatable spa via intermediate
`connecting layers;
`FIG. 9 is an exploded perspective view of an inflatable spa
`shown coupled to an exemplary control system of the present
`disclosure for supplying bubbles to the inflatable spa;
`FIG. 10 is a perspective view of the control system of FIG.
`
`9;
`
`50
`
`FIG. 11 is a perspective view of the control system of FIG.
`10 with an outer shell removed;
`FIG. 12 is a perspective view of the control system of FIG.
`11 with a control panel assembly removed;
`FIG. 13 is an elevational view of the control system ofFIG.
`55 12;
`FIG.14 is an elevational cross-sectional view of the control
`system of FIG. 11;
`FIG. 15 is an exploded perspective view of an air passage(cid:173)
`way of the control system of FIG. 9, the air passageway
`60 including an air pump, a first check valve, a drain valve, and
`a second check valve;
`FIG. 16 is a cross-sectional view of the air passageway of
`FIG. 15;
`FIG. 17 is an exploded perspective view of the air pump,
`65 the first check valve, and the drain valve of FIG. 15;
`FIG. 18 is a cross-sectional view of the air pump, the first
`check valve, and the drain valve of FIG. 17;
`
`Bestway Exhibit 1001-0042
`PGR2017-00003
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`US 9,254,240 B2
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`20
`
`5
`FIG. 19 is an exploded perspective view of the second
`check valve of FIG. 15;
`FIG. 20 is a cross-sectional view of the second check valve
`ofFIG. 19;
`FIG. 21 is an exploded perspective view of the control 5
`system of FIG. 9 shown in a deflation mode;
`FIG. 22 is a cross-sectional view of the control system of
`FIG. 21;
`FIG. 23 is a perspective view of the inflatable spa ofFIG. 9;
`FIG. 24 is a perspective cross-sectional view of the inflat- 10
`able spa of FIG. 23;
`FIG. 25 is an exploded perspective view of an exemplary
`heating unit of the present disclosure;
`FIG. 26 is a cross-sectional view of the heating unit ofFIG.
`25;
`FIG. 27 is a perspective view an exemplary control system
`of the present disclosure for supplying jetted water to an
`inflatable spa;
`FIG. 28 is a perspective view of the control system of FIG.
`27 with a base partially removed to show a drain assembly;
`FIG. 29 is a side cross-sectional view of the control system
`and the drain assembly of FIG. 28;
`FIG. 30 is a bottom plan view of the control system and the
`drain assembly of FIG. 28;
`FIG. 31 is a schematic view of a water inlet system to the 25
`control system of FIG. 27 including a water inlet pipe with a
`filtering cover;
`FIG. 32 is a perspective view of the water inlet pipe ofFIG.
`31;
`FIG. 33 is a cross-sectional view of the water inlet pipe of 30
`FIG. 32;
`FIG. 34 is a perspective view of the filtering cover of FIG.
`31;
`FIG. 35 is a cross-sectional view of the filtering cover of
`FIG. 34;
`FIG. 36 is a schematic view of a water outlet system from
`the control system of FIG. 27 including a water outlet pipe;
`FIG. 37 is a perspective view of the water outlet pipe of
`FIG. 36;
`FIG. 38 is a cross-sectional view of the water outlet pipe of 40
`FIG. 37;
`FIG. 39 is a perspective view of a spa with an external wall
`partially removed to show a jetted water pipe network includ(cid:173)
`ing a plural