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


Flex-Lite FL12 Composite Well Pressure Tank 35 gallonFlex-Lite FL12 Composite Well Pressure Tank 35 gallon
Part Number: FL12
p:9310; v:16812

Flex-Lite FL12 Composite Well Pressure Tank Features: The Flex-Lite FL12 is a corrosion-proof well pressure tank that is made with a composite of continuous strand fiberglass filament that is coated with epoxy. The Flex-Lite FL series features...
  • Total Volume: 35 Gallons
  • Inlet/Outlet Size: 1" MNPT PVC
  • Drawdown at 30/50 Setting: 11.9 Gallons
  • Height w/ Stand: 48.9 "
  • Diameter: 16.5 "
  • Tank Materials: Polypropylene tank reinforced with fiberglass, sealed with epoxy resin
  • Origin: USA
  • Certifications: NSF Certified to Standard 61
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$259.99 

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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
p:12442; v:25655

  • 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
p:3636; v:4282

Alternate Part Number: RO-1070, TKE-1070-14B-34, RO-1070, ROT-14W-34
Reverse Osmosis Storage Tanks #: Amtrol RO-14
  • 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 - $119.88

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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
p:12443; v:25656

  • 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
p:3682; v:4331

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
p:3681; v:4330

Alternate Part Number: TKE-2200W, RO-122, 200100
Reverse Osmosis Storage Tanks #: Aqua Sky ROT-3, Amtrol RO-3 (140S723)
  • 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: 14.6 "
  • 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
p:411; v:537

Alternate Part Number: TKE-2400-P, ROPT201-PLW, 52-35138, ROPRO4-W
  • Plasteel Storage Tank
  • 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
p:568; v:769

Alternate Part Number: RO-132, TK-PRO-4-SS, 15112006, 55984-05, ROT-4W
Reverse Osmosis Storage Tanks #: Amtrol RO-4 (141S351)
  • Powder Coated Steel Exterior
  • 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
p:10829; v:20029

Alternate Part Number: TP-19P, TKE-5000P, RO-145P
  • 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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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
p:5182; v:6298

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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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
p:4265; v:4988

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
$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
p:3678; v:4327

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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$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
p:412; v:538

Alternate Part Number: 143-293, 143-198, RO-14
Reverse Osmosis Storage Tanks #: PAE RO-1070
  • 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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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
p:4428; v:5384

Alternate Part Number: TKE-2000, RO-20, 144-120, 55984-07
  • White 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 Reverse Osmosis Storage Tank Composite 20 galROmate RO20 20 gal Reverse Osmosis Storage Tank Composite
Part Number: ROMATE-20
p:4775; v:5874

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 Storage Tank Steel 32 GalWell-Rite WR-100 32 Gal Well Pressure Storage Tank Steel
Part Number: WR-100
p:4427; v:5383

Alternate Part Number: WR-100R, FWR-100
Well-Rite WR-100 Well Pressure Storage Tank Steel 32 Gal 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...
  • 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
$359.00 

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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
p:571; v:772

  • 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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ROmate RO40 Reverse Osmosis Storage Tank Composite 40 GalROmate RO40 34682 Composite 40 Gal Reverse Osmosis Storage Tank Composite
Part Number: ROMATE-40
p:575; v:776

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
$485.00
$399.99 

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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
p:572; v:773

  • 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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Well-Rite WR-200 Well Pressure Storage Tank Steel 62 GalWell-Rite WR-200 62 Gal Well Pressure Storage Tank Steel
Part Number: WR-200
p:9305; v:16807

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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$599.00 

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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
p:576; v:777

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
$749.00 

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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
p:12462; v:25731

Alternate Part Number: RO-86PA
  • Powder Coated Steel Exterior
  • 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
p:573; v:774

  • 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-360 Well Pressure Storage Tank Steel 119 GalWell-Rite WR-360 119 Gal Well Pressure Storage Tank Steel
Part Number: WR-360
p:9308; v:16810

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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$956.40 

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ROMATE RO-120 Reverse Osmosis Storage Tank Composite 120 GalROMATE RO-120 Reverse Osmosis Storage Tank Composite 120 Gal
Part Number: ROMATE-120
p:12619; v:26308

Alternate Part Number: 34685, CH34395
  • High density polyethylene
  • Inlet/Outlet Size: 1-1/4" MPT
  • Height w/ Stand: 74.25 "
  • 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
$899.99 

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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