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Reverse Osmosis Storage Tanks


RO Water Storage Tanks No one offers a broader line of RO water storage tanks than we do. Our brands of reverse osmosis water tanks include genuine Amtrol RO tanks. Amtrol claims to have actually invented the technology behind RO tanks. So, if you need either a small RO tank for a point-of-use system, or a larger whole house tank, we offer the RO tank for your specific application. Below you will find water tanks for reverse osmosis drinking water systems that offer total holding volumes between 2 to 86 gallons that are constructed with steel and/or fiberglass.



Products


ROmate RO40 33472 Composite Reverse Osmosis Tank 40 Gallon - CLEARANCE 045120348ROmate RO40 33472 Composite Reverse Osmosis Tank 40 Gallon
Part Number: CLEARANCE
Alternate Part Number: ROMATE-40, CH33472, CH30865-1
MSRP: $1,008.00
$485.00 

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ROmate RO40 34682 Composite Reverse Osmosis Tank 40 GallonROmate RO40 34682 Composite Reverse Osmosis Tank 40 Gallon
Part Number: ROMATE-40
Alternate Part Number: CH33472
ROMate CH34682 RO40 Composite Reverse Osmosis Tank 40 Gallon Features: The ROMate RO40 40 Gallon RO water storage tank is designed for both residential and light commercial RO storage. The RO40 comes with a heavy-duty butyl aircell and seamless...
  • Total Volume: 40.3 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 56.75 "
  • Diameter: 16 "
  • Tank Materials: Seamless Composite
  • Origin: USA
  • Certifications: WQA Certified to Standard 372 for Lead Free Compliance, WQA Certified to Standard 61
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MSRP: $1,008.00
$485.00 

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RO Tank 2.1 Gal Powder Coated SteelPAE RO-120 2.1 Gallon RO Tank
Part Number: ROT-2.1
Alternate Part Number: 15092006, TK-PRO-2-SS, RO-120
  • Powder Coated Steel
  • Total Volume: 2.1 Gallons
  • Holding Capacity @ 40 psi: 1.1 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 12 "
  • Diameter: 7-7/8 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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MSRP: $61.00
$40.48 

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RO Tank 3.2 Gal, Plastic Protective Shell Over Steel TankRO Tank 3.2 Gal, Plastic Protective Shell Over Steel Tank
Part Number: ROT-3.2-P
Alternate Part Number: ROPT201-PLW, TP-12P, 52-35138,ROPRO4-W, RO-122P
  • Protective Polypropylene Outer Layer
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14.2 "
  • Diameter: 9.36 "
  • Tank Materials: Polypropylene Exterior/Interior, Steel Tank Frame
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$53.49 

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RO Water Storage Tank 3.2 Gal Powder Coated SteelPAE RO-122 3.2 Gallon RO Tank
Part Number: ROT-3.2
Alternate Part Number: TKE-2200W, RO-122, 200100
  • Powder Coated Steel Exterior
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14 "
  • Diameter: 9 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$43.48 

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Amtrol RO Tank 3 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 3 Gal Steel RO-3 140S723
Part Number: 140S723
Alternate Part Number: RO-3, 92288
  • Powder Coated Steel Exterior
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14-3/32 "
  • Diameter: 9-1/16 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$63.87 

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RO Water Storage Tank 4.5 Gal Powder Coated SteelPAE RO-132 4.4 Gallon RO Water Storage Tank
Part Number: ROT-4.5
Alternate Part Number: RO-132, TK-PRO-4-SS, 15112006, 55984-05, ROT-4W
  • Powder Coated Steel Exterior
  • Total Volume: 4.4 Gallons
  • Holding Capacity @ 40 psi: 2.8 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 13-3/4 "
  • Diameter: 11 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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MSRP: $51.83
$41.88 

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Amtrol RO Tank 4.4 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 4.4 Gal Steel RO-4 141S351
Part Number: 141S351
Alternate Part Number: RO-4, 140S351, 92294, TK-AM005W
  • Powder Coated Steel Exterior
  • Total Volume: 4.4 Gallons
  • Holding Capacity @ 40 psi: 2.8 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 15 "
  • Diameter: 11 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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MSRP: $79.95
$57.99 

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RO Tank 5 Gal, Plastic Protective Shell Over Steel TankRO Tank 5 Gal, Plastic Protective Shell Over Steel Tank ROT-5P
Part Number: ROT-5P
Alternate Part Number: TP-19P
  • Protective Polypropylene Outer Layer
  • Total Volume: 5 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 15.8 "
  • Diameter: 11 "
  • Tank Materials: Polypropylene, Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$58.88 

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RO Water Storage Tank 5.5 Gal Powder Coated SteelPAE RO-152 5.5 Gallon RO Tank
Part Number: ROT-5.5
Alternate Part Number: TK-PRO-6W, RO-152
  • Powder Coated Steel Exterior
  • Total Volume: 5.5 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/ Stand: 16.06 "
  • Diameter: 11.5 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$58.40 

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Amtrol RO-10 RO Tank 10 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 10 Gal Steel RO-10 143-132
Part Number: 143-132
Alternate Part Number: RO-10
  • Powder Coated Steel Exterior
  • Total Volume: 10 Gallons
  • Holding Capacity @ 40 psi: 6.3 Gallons
  • Inlet/Outlet Size: 3/4" MPT
  • Height w/ Stand: 17-3/8 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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MSRP: $199.95
$179.73 

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RO Water Storage Tank 9.2 Gal Steel 1/4 MPTTankPAC TP-35 9.2 Gallon RO Water Storage Tank
Part Number: ROT-10B-14
Alternate Part Number: TP35, RO-760, RO-11,55984-06
  • Powder Coated Steel Exterior
  • Total Volume: 9.2 Gallons
  • Holding Capacity @ 40 psi: 5.5 Gallons
  • Inlet/Outlet Size: 1/4" MPT, 3/4" MPT
  • Height w/o Stand: 21.1 "
  • Diameter: 12.5 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$119.88 

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RO Water Storage Tank 14 Gal SteelPAE RO-1070 14 Gallon RO Tank
Part Number: ROT-14W-14
Alternate Part Number: RO-1070, TKE-1070-14B-34, RO-1070
  • Features a Powder Coated Steel Exterior
  • Total Volume: 14 Gallons
  • Holding Capacity @ 40 psi: 9 Gallons
  • Inlet/Outlet Size: 1/4" or 3/4" MPT Stainless Steel
  • Height w/ Stand: 22-7/8 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$109.88

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Amtrol RO Tank 14 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 14 Gal Steel RO-14, 143-293, 143-198
Part Number: 143
Alternate Part Number: 143-293, 143-198, RO-14
  • Powder Coated Steel Exterior
  • Total Volume: 14 Gallons
  • Holding Capacity @ 40 psi: 9.0 Gallons
  • Inlet/Outlet Size: 1/4" or 3/4" MPT Stainless Steel
  • Height w/ Stand: 22-13/16 "
  • Diameter: 15-3/8 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$189.99 

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RO Water Storage Tank 20 Gal SteelPAE RO-2000 - 20 Gallon RO Tank
Part Number: ROT-20-34
Alternate Part Number: TKE-2000, RO-20, 144-120, 55984-07
  • Powder Coated Steel Exterior
  • Total Volume: 20 Gallons
  • Holding Capacity @ 40 psi: 11 Gallons
  • Inlet/Outlet Size: 3/4" MPT
  • Height w/ Stand: 30 "
  • Diameter: 16 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$139.88 

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ROmate RO20 34680 Composite Reverse Osmosis Tank 20 gallonROmate RO20 34680 Composite Reverse Osmosis Tank 20 gallon
Part Number: ROMATE-20
Alternate Part Number: 34680, CH30839
  • High density polyethylene
  • Total Volume: 19.8 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 32.25 "
  • Diameter: 16 "
  • Tank Materials: Seamless Composite
  • Origin: USA
  • Certifications: WQA Certified to Standard 372 for Lead Free Compliance, WQA Certified to Standard 61
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MSRP: $650.00
$279.99 

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Well-Rite WR-100 Well Pressure Tank 32 Gallon SteelWell-Rite WR-100 Well Pressure Tank 32 Gallon Steel
Part Number: WR-100
Alternate Part Number: WR-100R, FWR-100
Well-Rite WR-100 Well Pressure Tank Features: The Well-Rite WR-100 Well Pressure Tank is a diaphragm type pre-charged hydro-pneumatic tank designed for residential and commercial water well, pressure booster, irrigation and reverse osmosis...
  • Total Volume: 32 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 10.9 Gallons
  • Height w/ Stand: 27.75 "
  • Diameter: 21 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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MSRP: $468.18
$362.86 

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Amtrol RO Tank 34 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 34 Gal Steel RO-34 147-47
Part Number: 147-47
  • Powder Coated Steel Exterior
  • Total Volume: 34 Gallons
  • Holding Capacity @ 40 psi: 18.2 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 29-1/2 "
  • Diameter: 22 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$428.00 

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Well-Rite WR-140 Well Pressure Tank 44 Gallon SteelWell-Rite WR-140 Well Pressure Tank 44 Gallon Steel
Part Number: WR-140
Alternate Part Number: WR-140R, FWR-140
  • Total Volume: 44 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 15 Gallons
  • Height w/ Stand: 36.25 "
  • Diameter: 21 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$412.70 

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Amtrol RO Tank 44 Gal SteelAmtrol Reverse Osmosis Water Storage RO Tank 44 Gal Steel RO-44 147-69
Part Number: 147-69
  • Powder Coated Steel Exterior
  • Total Volume: 44 Gallons
  • Holding Capacity @ 40 psi: 24.1 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 29-1/2 "
  • Diameter: 22 "
  • Tank Materials: Steel
  • Origin: USA
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$558.99 

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ROMATE RO80 34684 Composite RO Tank 80 GallonROMATE RO80 34684 Composite RO Tank 80 Gallon
Part Number: ROMATE-80
Alternate Part Number: 34684, CH34473
  • High density polyethylene
  • Total Volume: 86.7 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 55.5 "
  • Diameter: 24.25 "
  • Tank Materials: Seamless Composite
  • Origin: USA
  • Certifications: WQA Certified to Standard 372 for Lead Free Compliance, WQA Certified to Standard 61
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MSRP: $1,540.00
$719.00 

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Amtrol RO Tank 86 Gal SteelAmtrol RO-86 Reverse Osmosis Water Storage RO Tank 86 Gal Steel 150-6
Part Number: 150-6
  • Powder Coated Steel Exterior
  • Total Volume: 86 Gallons
  • Holding Capacity @ 40 psi: 47.2 Gallons
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 47-13/16 "
  • Diameter: 26 "
  • Tank Materials: Steel
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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MSRP: $979.00
$849.00 

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Well-Rite WR-120 Well Pressure Tank 33.4 Gallon SteelWell-Rite WR-120 Well Pressure Tank 33.4 Gallon Steel
Part Number: WR-120
Alternate Part Number: FWR-120, WR-120R
  • Total Volume: 33.4 Gallons
  • Inlet/Outlet Size: 1" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 11.3 Gallons
  • Height w/ Stand: 42.75 "
  • Diameter: 16 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$374.39 

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Well-Rite WR-200 Well Pressure Tank 62 Gallon SteelWell-Rite WR-200 Well Pressure Tank 62 Gallon Steel
Part Number: WR-200
Alternate Part Number: WR-200R, FWR-200
  • Total Volume: 62 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 21.1 Gallons
  • Height w/ Stand: 48 "
  • Diameter: 21 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$547.89 

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Well-Rite WR-240 Well Pressure Tank 81 Gallon SteelWell-Rite WR-240 Well Pressure Tank 81 Gallon Steel
Part Number: WR-240
Alternate Part Number: WR-240R, FWR-240
  • Total Volume: 81 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 27.6 Gallons
  • Height w/ Stand: 62 "
  • Diameter: 21 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$575.04 

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Well-Rite WR-260 Well Pressure Tank 85 Gallon SteelWell-Rite WR-260 Well Pressure Tank 85 Gallon Steel
Part Number: WR-260
Alternate Part Number: WR-260R, FWR-260
  • Total Volume: 85 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 29 Gallons
  • Height w/ Stand: 44.5 "
  • Diameter: 26 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$603.84 

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Well-Rite WR-360 Well Pressure Tank 119 Gallon SteelWell-Rite WR-360 Well Pressure Tank 119 Gallon Steel
Part Number: WR-360
Alternate Part Number: WR-360R, FWR-360
  • Total Volume: 119 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Drawdown at 30/50 Setting: 40.6 Gallons
  • Height w/ Stand: 59.75 "
  • Diameter: 26 "
  • Tank Materials: Drawn Steel w/ Epoxy Finish
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$853.44 

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Tank Stand for 1 gal to 4 gal RO TanksTank Stand for 1 gal to 4 gal RO Tanks
Part Number: 141-950
Tank Stand for 1 Gal to 4 Gal Reverse Osmosis Tanks 141-950 Features: The plastic tank stand for reverse osmosis accumulator tanks fits Amtrol RO tank models RO-1, RO-2, RO-3, RO-4 and PAE RO tank models RO-122 (3.2 gal), RO-132 / ROT-4W (4.4 gal).View Details
$3.86 

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Tank Stand for 3 to 4 Gal RO TanksTank Stand for 3 to 4 Gal RO Tanks
Part Number: PTS502
Tank Stand for 3 to 4 Gal RO Tanks PTS502 Features: The plastic tank stand for reverse osmosis accumulator tanks fits most RO tanks with an empty capacity of 3 to 4 gallons, including Amtrol RO-4, PAE RO tank models RO-122 (3.2 gal), RO-132 /...View Details
$4.16 

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Tank Pressure Gauge (0-20 psi)Tank Pressure Gauge (0-20 psi)
Part Number: 54846
Tank Pressure Gauge Features: Over time, the bladder of your tank will lose air pressure. This will cause your system to operate incorrectly. Use a Tank Pressure Gauge to monitor the air pressure in your RO bladder tank. Measures from 0 to 20 psi...View Details
MSRP: $9.95
$8.79 

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Sanitizer Syringe 10ccSanitizer Syringe 10cc
Part Number: C4013
Qosina C4013 Sanitizer Syringe with Luer Slip 10cc Features: Construction: Polypropylene Body and Plunger with a Polyisoprene Seal Use: Sanitizing filter housings, tubing and RO Tanks Sanitizer Syringe 10cc Instructions: Remove tube from Tank...View Details
$1.01 

10+ for $.81 ea
25+ for $.66 ea
50+ for $.61 ea
100+ for $.54 ea

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DMfit Union Tee - 1/4" x 1/4" x 1/4" Push-inDMfit Union Tee - 1/4
Part Number: ATU040404
DMfit ATU040404 Union Tee - 1/4" x 1/4" x 1/4" Push-in Features: Acetal copolymer construction O-rings are NBR (Buna-N) Unique oval collet design FDA approved materials For water, air, gases, vacuum, & liquids NSF Certified 51 & 62...View Details
$1.93 

20+ for $1.74 ea
50+ for $1.54 ea
100+ for $1.35 ea

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DMfit Union Tee - 3/8" x 3/8" x 3/8" Push-inDMfit Union Tee - 3/8
Part Number: ATU060606
DMfit ATU060606 Union Tee - 3/8" x 3/8" x 3/8" Push-in Features: Acetal copolymer construction O-rings are NBR (Buna-N) Unique oval collet design FDA approved materials For water, air, gases, vacuum, & liquids NSF Certified 51 & 62...View Details
$2.80 

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DMfit REDUCING Union Tee - 3/8" x 3/8" x 1/4" Push-inDMfit REDUCING Union Tee - 3/8
Part Number: ATU060604
DMfit ATU060604 REDUCING Union Tee - 3/8" x 3/8" x 1/4" Push-in Features: Acetal copolymer construction O-rings are NBR (Buna-N) Unique oval collet design FDA approved materials For water, air, gases, vacuum, & liquids NSF Certified 51 &...View Details
$2.76 

10+ for $2.24 ea
40+ for $1.79 ea

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John Guest Shut-Off Valve-Polypro Elbow NPTF - 1/4 x 1/4 NPTFJohn Guest Shut-Off Valve-Polypro Elbow NPTF - 1/4 x 1/4 NPTF
Part Number: PPSV500822W
John Guest PPSV500822W Shut-Off Valve-Polypro Elbow NPTF - 1/4 x 1/4 NPTF Features: Gray acetal copolymer construction Nitrile O-rings FDA approved materials NSF Certified 51 & 62 Suitable for water, air, inert gases And pneumatic...View Details
MSRP: $6.42
$5.25 

5+ for $5.20 ea
10+ for $5.09 ea
50+ for $4.99 ea
100+ for $4.83 ea
200+ for $4.73 ea

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John Guest Shut-Off Valve-Polypro Elbow NPTF - 3/8 x 1/4 NPTFJohn Guest Shut-Off Valve-Polypro Elbow NPTF - 3/8 x 1/4 NPTF
Part Number: PPSV501222W
John Guest PPSV501222W Shut-Off Valve-Polypro Elbow NPTF - 3/8 x 1/4 NPTF Features: Gray acetal copolymer construction Nitrile O-rings FDA approved materials NSF Certified 51 & 62 Suitable for water, air, inert gases And pneumatic...View Details
MSRP: $6.57
$5.47 

5+ for $5.42 ea
10+ for $5.31 ea
50+ for $5.20 ea
100+ for $5.03 ea
200+ for $4.92 ea

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Shut-Off Valve Kit - 3/4 Female NPTF x 3/8 Push-inShut-Off Valve Kit - 3/4 Female NPTF x 3/8 Push-in
Part Number: BVK-PVC80075-06
TANK BALL VALVE KIT is recommended for the 14 gallon storage tank . A 3/4" Female Coupling is provided to connect 3/4" male NPT end of tank valve to 3/4" male NPT tank inlet. Features: Exclusive 1/4 turn lever with safety collar Dual EPDM O-ring...View Details
$11.68 

10+ for $8.76 ea
50+ for $7.59 ea

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Shut-Off Valve Kit - 3/4 Female NPTF x 1/2 Push-inShut-Off Valve Kit - 3/4 Female NPTF x 1/2 Push-in
Part Number: BVK-PVC80075-08
TANK BALL VALVE KIT is recommended for the 14 gallon storage tank . A 3/4" Female Coupling is provided to connect 3/4" male NPT end of tank valve to 3/4" male NPT tank inlet. Features: Exclusive 1/4 turn lever with safety collar Dual EPDM O-ring...View Details
$12.32 

10+ for $9.24 ea
50+ for $8.01 ea

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RO WATER STORAGE HOLDING TANK CAPACITY
AT VARIOUS INLET PRESSURES PRE-CHARGED PRESSURE @ 5 PSIG
NOTE: PRECHARGE FOR ROMATE20, 40 & 80 = 10 PSIG

Model No.Total Tank
Volume (gal)
Gals @
20 psig
Gals @
30 psig
Gals @
40 psig
Gals @
50 psig
Gals @
60 psig
Gals @
70 psig
RO-2/RO1202.00.91.11.31.41.51.5
RO-3/RO1223.21.41.82.02.22.42.5
RO-4/RO132*4.41.92.52.83.13.23.4
RO-10/RO76010.04.35.66.36.97.37.6
RO-14/RO107014.06.17.89.09.710.310.7
ROMATE2019.85.78.910.912.213.314.0
RO-20/RO200020.05.88.911.0***
RO-3434.09.114.718.220.622.423.8
ROMATE4040.311.618.022.124.927.028.5
RO-4444.012.719.724.127.229.531.2
RO-8686.024.838.547.253.2**
ROMATE8086.724.9938.847.553.658.0361.42

*  RO-4 / RO-132 / ROT-4 is the Standard Size RO Tank for most RO systems.

As your water demands grow, one thing to consider with a reverse osmosis drinking water system is the capacity of the RO storage tank. RO water storage tank holding capacity is dependent on INLET water pressure to the tank and the RO tank air pressure. Typically the RO tank capacity is 50% of the total RO tank volume (empty). Many popular systems come with RO tanks with storage and the capacities that range from 4 gallons to 25 gallons RO tanks and up. One of the easiest ways to extend the available filtered water is to add an additional RO tank.

Options to increase reverse osmosis water tank storage capacity:

  1. Tee a line to a second tank of any capacity
    -- must have the same precharge as your existing tank
  2. Remove the existing RO water tank and replace with a larger tank of your choice