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3) Water Pressure – The Most Important Factor!
RO systems run on water pressure. Therefore your water pressure has the most direct effect on how
well your RO will perform. With sufficient water pressure (90 psi max.), your RO system will func-
tion well, give high output with high rejection rate, and fill up the storage tank quickly.
4) How Long Does It Take to Fill Tank?
Depending on your water pressure, the standard tank will fill up in 2-3 hours. After the tank is filled, the RO
will shut off automatically.
5) How Full Can My Tank Fill Up?
Your water pressure and temperature will determine how full and how fast the storage tank will be filled
up. The stronger your input water pressure, the faster and fuller the tank can fill. If water pressure is low, the
tank will fill slower and will not fill up to its full capacity.
For a non-pumped RO system:
The 4* gallon tank will fill up according to your input water pressure as follows:
Input 70+ psi —> tank fills 3.1 gallon ( almost 100% full )
Input 60 psi —> tank fills 2.8 gallon ( about 88% full )
Input 50 psi —> tank fills 2.5 gallon ( about 70% full )
Input 40 psi —> tank fills 1.9 gallon ( about 50% full )
So, if your input water pressure is low, the tank will not fill up to full.
* 4-gal refers to tank’s total volume (air space & bladder). At 80-90psi, tank bladder’s capacity is around 3.2 gallons.
6) How Much Pressure Can RO Deliver to My Ice-Maker?
The RO’s delivery pressure depends on how full the tank is. The pressure is high when tank is full, and
drops when tank depletes. See chart below for 4gal tank.
4-gallon tank’s delivery pressure:
3.0 gallon —> 50 psi output/delivery pressure (pressure inside tank)
2.5 gallon —> 36psi
2.0 gallon —> 24 psi
1.5 gallon —> 18 psi
1.0 gallon —> 14 psi
0.5 gallon —> 10psi
Tank empty —> 5 psi (pre-charged pressure)
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