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.

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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