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5) System Slow Shut-Off: Waste water runs for hours (6-7 hrs) - but Eventually Stops
The most common cause for “slow-shut-off” is insufficient input water pressure. RO needs
sufficient input pressure to shut off promptly.
Claimed GPD:
The claimed gallon per day (GPD) flow rate for each RO model is rated based on 60 psi input
water pressure at 77 degree F water temperature. At this standard water pressure and
temperature, the RO-90 gpd system should make about 3.7 gal of filtered water per hour, the
4-gal tank should fill in 1-1.5 hours.
Lower water pressure and colder temperature will slow the system’s output to less than the
claimed GPD flow rate. Please check your water pressure as the first step in determining the cause
of slow flow rate (low GPD)
.
3) Sluggish Flow At Dispensing Faucet
- Insufficient water pressure (see “RO Basics” for explanation) —> Check water pressure. If too
low for this chosen RO model, either increase your water pressure or add pump to RO system.
- Input water to RO is blocked —> Make sure Feed water valve is fully opened and unhindered.
- Tank not filled yet —> Wait until tank is more filled, takes 2-3 hours average.
- Low tank pre-charge pressure —> Raise tank pre-charge to 5-7 psi.
4) Tank Takes Long Time To Fill (does not meet claimed GPD)
- Insufficient water pressure (below 60 psi for non-pump systems) —> Increase house water pres-
sure or add an appropriate pump to system.
- Low water temperature (below 77 degree F ) —> Increase house water pressure or add pump to
compensate for low (cold) water temperature.
- Input water pressure too low (below 40psi). Not enough pressure to shut off RO promptly —>
Check input water pressure. If pressure is low, boost house pressure or add pump to RO.
- Feed water valve partially blocked, not opened fully, reducing input water pressure to RO —>
Check and fix feed water valve, make sure it is opened fully to allow maximum pressure to RO.
- Stages 1, 2, 3 pre-filters partially clogged, reducing the input water pressure in RO —> Check
stage-1 filter to see if it’s very dirty. If this filter has turned brown or other color in just 1-3
months, that means your input water has very heavy sediments and other clogging agents. Need
to replace stage-1 filter frequently.
- RO busy feeding multiple output points —> If your RO feeds multiple outlets (icemaker,
bathroom, aquarium), the waste water will run as long as the RO is making water to fill the tank
and other output points. In this case, it’s normal to hear waste water running.
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