Reverse Osmosis Storage Tanks



High Quality Reverse Osmosis Tanks for your RO System
No one offers a broader line of RO water storage tanks than we do. Fresh Water Systems offers metal, plastic and composite reverse osmosis water storage tanks in a wide
range of sizes. These tanks are fully enclosed with polypropylene and butyl reservoirs, ensuring that drinking water does not come in contact with
 metal. All of our RO tanks are NSF certified for materials, quality,
and safety. So, if you need either a small RO tank for a point-of-
use system, or something much larger, we offer the right Reverse
Osmosis tank for your specific application.

Browse our Reverse Osmosis Systems.
Browse our Reverse Osmosis Membrane
Compare Reverse Osmosis Tank storage holding capacities.

Products


Clack C2250 RT40 Retention Tank 40 GalC2250 RT40 Retention Tank 40 Gal
Part Number: C2250
Alternate Part Number: RT40
  • Total Volume: 4 Gallons
  • Height w/ Stand: 40.5 "
  • Diameter: 21 "
  • Tank Materials: Fiberglass Resin
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MSRP: $1,008.00
$485.00
$399.99 

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PAE RO-105 Reverse Osmosis Storage Tank Powder Coated Steel 0.5 Gal0.5 Gal PAE Reverse Osmosis Tank Powder Coated Steel
Part Number: ROT-0.5-14
  • Total Volume: 0.5 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 7.9 "
  • Diameter: 5.0 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$29.99 

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PAE RO-1070 Reverse Osmosis Storage Tank Powder Coated Steel 14 GalPAE RO-1070 14 Gal Reverse Osmosis Storage Tank Powder Coated Steel
Part Number: ROT-14W-14
Alternate Part Number: RO-1070, TKE-1070-14B-34, RO-1070, ROT-14W-34
Reverse Osmosis Storage Tanks #: Amtrol RO-14
  • 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 - $119.88

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PAE RO-2000 Reverse Osmosis Storage Tank Powder Coated Steel 40 GalPAE RO-2000 Reverse Osmosis Storage Tank Powder Coated Steel 40 Gal
Part Number: ROT-40-10
Alternate Part Number: TP-150
  • Total Volume: 40 ft3
  • Holding Capacity @ 40 psi: 11 ft3
  • Inlet/Outlet Size: 3/4" MPT
  • Height w/ Stand: 46.90 "
  • Diameter: 16.90 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$189.00 

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PAE ROT-20-10 Reverse Osmosis Storage Tank Powder Coated Steel 20 GalPAE ROT-20-10 Reverse Osmosis Storage Tank Powder Coated Steel 20 Gal
Part Number: ROT-20-10
Alternate Part Number: TKE-2000, RO-20, 144-120, 55984-07
  • Total Volume: 20 Gallons
  • Holding Capacity @ 40 psi: 11 ft3
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 31.6 "
  • Diameter: 15.5 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$93.08 

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PAE TP-16P Reverse Osmosis Plasteel Storage Tank 4 GalPAE TP-16P Reverse Osmosis Plasteel Storage Tank 4 Gal
Part Number: ROT-4P
PAE TP-16P Reverse Osmosis Plasteel Storage Tank 4 Gal The PAE TP-16P RO Tank is a steel five-gallon reverse osmosis tank with a polypropylene outer and inner layer. The TP-16P is constructed using FDA approved materials and has been extensively...
  • Total Volume: 4.2 ft3
  • Holding Capacity @ 40 psi: 4 gallons ft3
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14.6 "
  • Diameter: 9.8 "
  • Certifications: NSF Certified to Standard 58
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$32.79 

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ROmate RO-15 Reverse Osmosis Storage Tank Composite 15 galROmate RO15 Reverse Osmosis Storage Tank Composite 15 gal
Part Number: ROMATE-15
Alternate Part Number: 34679
ROMATE RO-15 Reverse Osmosis Storage Tank Composite 15 Gal The ROMATE RO-15 Reverse Osmosis Storage Tank is designed for both residential and light commercial RO storage. The RO15 comes with a heavy-duty butyl aircell and seamless composite...
  • Total Volume: 14.5 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 26-1/2 "
  • 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
$289.95 

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ROmate RO30 Reverse Osmosis Storage Tank Composite 30 galROmate RO30 Reverse Osmosis Storage Tank Composite 30 gal
Part Number: ROMATE-30
Alternate Part Number: 34681
ROMATE RO-30 Reverse Osmosis Storage Tank Composite 30 Gal The ROMATE RO-30 Reverse Osmosis Storage Tank is designed for both residential and light commercial RO storage. The RO30 comes with a heavy-duty butyl aircell and seamless composite...
  • Total Volume: 29.5 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 44 "
  • 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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$489.95 

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PAE TP-4 Reverse Osmosis Storage Tank Powder Coated Steel 1.0 GalPAE TP-4 1.0 Gal Reverse Osmosis Storage Tank Powder Coated Steel
Part Number: ROT-1.0-14
  • Total Volume: 1.0 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 9.5 "
  • Diameter: 6.3 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$39.99 

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PAE RO-120 Reverse Osmosis Storage Tank Powder Coated Steel 2.1 GalPAE RO-120 2.1 Gal Reverse Osmosis Storage Tank Powder Coated Steel
Part Number: ROT-2.1
Alternate Part Number: 15092006, TK-PRO-2-SS, RO-120
  • 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
$29.99 

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PAE RO-122 Reverse Osmosis Storage Tank Powder Coated Steel 3.2 GalPAE RO-122 3.2 Gal Reverse Osmosis Storage Tank Powder Coated Steel
Part Number: ROT-3.2
Alternate Part Number: TKE-2200W, RO-122, 200100
Reverse Osmosis Storage Tanks #: Aqua Sky ROT-3, Amtrol RO-3 (140S723)
PAE RO-122 Reverse Osmosis Storage Tank Powder Coated Steel 3.2 Gal The PAE RO-122 is built with FDA approved materials. The water storage chamber features a virgin polypropylene liner, high-grade chlorobutyl diaphragm and stainless steel 1/4"...
  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14.6 "
  • Diameter: 9.8 "
  • Tank Materials: Steel
  • Origin: Taiwan
  • Certifications: NSF Certified to Standard 58
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$35.99 

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PAE TP-12P Reverse Osmosis Plasteel Storage Tank 3.2 GalPAE TankPac TP-12P 3.2 Gal Reverse Osmosis Storage Tank Plastic Protective Shell over Steel Tank
Part Number: ROT-3.2-P
Alternate Part Number: TKE-2400-P, ROPT201-PLW, 52-35138, ROPRO4-W

  • Total Volume: 3.2 Gallons
  • Holding Capacity @ 40 psi: 2 Gallons
  • Inlet/Outlet Size: 1/4" MPT
  • Height w/o Stand: 14.3 "
  • Diameter: 9.4 "
  • Certifications: NSF Certified to Standard 58
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$53.49
$39.99 

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PAE RO-132 Reverse Osmosis Storage Tank Powder Coated Steel 4.5 GalPAE RO-132 4.5 Gal Reverse Osmosis Storage Tank Powder Coated Steel
Part Number: ROT-4.5
Alternate Part Number: RO-132, TK-PRO-4-SS, 15112006, 55984-05, ROT-4W
Reverse Osmosis Storage Tanks #: Amtrol RO-4 (141S351)
PAE RO-132 Reverse Osmosis Storage Tank Powder Coated Steel 4.5 Gal The PAE TankPAC RO-132 is built with FDA approved materials. The water storage chamber features a virgin polypropylene liner, high-grade chlorobutyl diaphragm and stainless steel...
  • Total Volume: 4.5 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
$34.65 

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PAE TankPAC TP-19P Reverse Osmosis Storage Tank Plastic Protective Shell Over Steel Tank 5 GalPAE TankPAC TP-19P 5 Gal Reverse Osmosis Storage Tank Plastic Protective Shell Over Steel Tank
Part Number: ROT-5P
Alternate Part Number: TP-19P, TKE-5000P, RO-145P
PAE TankPAC TP-19P Reverse Osmosis Storage Tank Plastic Protective Shell Over Steel Tank 5 Gal The TankPAC TP-19P RO Tank is a steel five-gallon reverse osmosis tank with a polypropylene outer and inner layer. The TP-19P is constructed using FDA...
  • 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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PAE RO-152 Reverse Osmosis Water Storage Tank Powder Coated Steel 5.5 GalPAE RO-152 5.5 Gal Reverse Osmosis Water Storage Tank Powder Coated Steel
Part Number: ROT-5.5
Alternate Part Number: TK-PRO-6W, RO-152
PAE RO-152 Reverse Osmosis Water Storage Tank Powder Coated Steel 5.5 Gal The PAE RO-152 is built with FDA approved materials. The water storage chamber features a virgin polypropylene liner, high-grade chlorobutyl diaphragm and stainless steel...
  • 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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MSRP: $58.40
$55.45 

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PAE TankPAC TP-35 9.2 Gal Reverse Osmosis Tank Powder Coated SteelPAE TankPAC TP-35 9.2 Gal Reverse Osmosis Tank Powder Coated Steel
Part Number: ROT-10W-14
Alternate Part Number: TP35, RO-760, RO-11, 55984-06
PAE TankPAC TP-35 9.2 Gal Reverse Osmosis Tank Powder Coated Steel The TankPAC TP-35 is built with FDA approved materials. The water storage chamber features a virgin polypropylene liner, high-grade chlorobutyl diaphragm and stainless steel 1/4"...
  • 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
$99.99 

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Amtrol RO-10 Reverse Osmosis Storage Tank Steel 10 GalAmtrol RO-10 10 Gal Reverse Osmosis Water Storage Tank Steel 143132
Part Number: 143-132
Alternate Part Number: RO-10
Amtrol RO-10 Reverse Osmosis Storage Tank Steel 10 Gal Amtrol water storage tanks are built tough to last. Each tank is individually tested, making them extremely safe. They're designed to meet the most demanding specifications for potable water....
  • 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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$219.99 

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Amtrol Reverse Osmosis Storage Tank Steel 14 GalAmtrol 14 Gal Reverse Osmosis Storage Tank Steel RO-14
Part Number: 143
Alternate Part Number: 143-293, 143-198, RO-14
Reverse Osmosis Storage Tanks #: PAE RO-1070
  • 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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PAE RO-2000 Reverse Osmosis Storage Tank Powder Coated Steel 20 GalPAE RO-2000 Reverse Osmosis Storage Tank Powder Coated Steel 20 Gal
Part Number: ROT-20-34
Alternate Part Number: TKE-2000, RO-20, 144-120, 55984-07
PAE RO-2000 Reverse Osmosis Storage Tank Powder Coated Steel 20 Gal The PAE RO-2000 is built with FDA approved materials. The water storage chamber features a virgin polypropylene liner, high-grade chlorobutyl diaphragm and stainless steel 3/4"...
  • 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 Reverse Osmosis Storage Tank Composite 20 galROmate RO20 20 gal Reverse Osmosis Storage Tank Composite
Part Number: ROMATE-20
Alternate Part Number: 34680, CH30839
ROMATE RO-20 Reverse Osmosis Storage Tank Composite 20 Gal The ROMATE RO-20 Reverse Osmosis Storage Tank is designed for both residential and light commercial RO storage. The RO20 comes with a heavy-duty butyl aircell and seamless composite...
  • Total Volume: 19.8 Gallons
  • Inlet/Outlet Size: 1" MPT
  • Height w/ Stand: 32-1/4 "
  • 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
$329.95 

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Amtrol Reverse Osmosis Storage Tank Steel 34 GalAmtrol 34 Gal Reverse Osmosis Storage Tank Steel RO-34 - 147-47
Part Number: 147-47
Amtrol Reverse Osmosis Storage Tank Steel 34 Gal Amtrol water storage tanks are built tough to last. Each tank is individually tested, making them extremely safe. They're designed to meet the most demanding specifications for potable water. Each...
  • 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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ROmate RO40 Reverse Osmosis Storage Tank Composite 40 GalROmate RO40 34682 Composite 40 Gal Reverse Osmosis Storage Tank Composite
Part Number: ROMATE-40
Alternate Part Number: CH33472
ROmate RO40 Reverse Osmosis Storage Tank Composite 40 Gal The ROmate RO40 Reverse Osmosis Storage Tank is designed for both residential and light commercial RO storage. The RO40 comes with a heavy-duty butyl aircell and seamless composite...
  • 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
$589.00 

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Amtrol Reverse Osmosis Storage Tank Steel 44 GalAmtrol Reverse Osmosis Storage Tank Steel 44 Gal RO-44 - 147-69
Part Number: 147-69
Amtrol Reverse Osmosis Storage Tank Steel 44 Gal Amtrol water storage tanks are built tough to last. Each tank is individually tested, making them extremely safe. They're designed to meet the most demanding specifications for potable water. Each...
  • 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 RO-80 Reverse Osmosis Storage Tank Composite 80 GalROMATE RO-80 80 Gal Reverse Osmosis Storage Tank Composite
Part Number: ROMATE-80
Alternate Part Number: 34684, CH34473
ROMATE RO-80 Reverse Osmosis Storage Tank Composite 80 Gal The ROMATE RO-80 Reverse Osmosis Storage Tank is designed for both residential and light commercial RO storage. The RO80 comes with a heavy-duty butyl aircell and seamless composite...
  • 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
$769.95 

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Amtrol Pro Access Reverse Osmosis Storage Tank Steel 86 GalAmtrol 150-86 Pro Access Reverse Osmosis Storage Tank Steel 86 Gal RO-86PA
Part Number: 150-86
Alternate Part Number: RO-86PA
Amtrol Pro Access Reverse Osmosis Storage Tank Steel 86 Gal Amtrol 150-86 Reverse Osmosis Storage Tank is built tough to last. Amtrol tanks are individually tested, making them extremely safe. The 150-86 RO tank uses the Pro Access Stainless...
  • Total Volume: 86 Gallons
  • Inlet/Outlet Size: 1-1/4" FNPT Stainless Steel
  • Height w/ Stand: 47 "
  • Diameter: 26 "
  • Tank Materials: Stainless Steel
  • Certifications: NSF Certified to Standard 58
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MSRP: $999.00
$880.99 

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Amtrol Reverse Osmosis Storage Tank Steel 86 GalAmtrol 150-6 Reverse Osmosis Storage Tank Steel 86 Gal
Part Number: 150-6
Amtrol Reverse Osmosis Storage Tank Steel 86 Gal Amtrol water storage tanks are built tough to last. Each tank is individually tested, making them extremely safe. They're designed to meet the most demanding specifications for potable water. Each...
  • 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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Pentair ROmate RO-120 Reverse Osmosis Storage Tank Composite 120 Gal - 34685ROMATE RO-120 Reverse Osmosis Storage Tank Composite 120 Gal
Part Number: ROMATE-120
Alternate Part Number: 34685, CH34395
Pentair ROMATE RO-120 Reverse Osmosis Storage Tank Composite 120 Gal - 34685 The ROmate RO-120 Reverse Osmosis Storage Tank is designed for both residential and light commercial RO storage. The RO120 comes with a heavy-duty butyl aircell and...
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 74-1/4 "
  • Diameter: 24 "
  • 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
$878.00 

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