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RO Storage Tank Takes A Long Time To Fill

If the RO unit takes a long time to fill the storage tank, please review the possible factors below.

  • Insufficient water pressure (below 40 psi for non-pump systems) > Increase house water pressure, if possible or add an appropriate pump to system. Please contact an APEC Representative for assistance.
  • Low water temperature (below 77 degree F) > Increase house water pressure or add pump to compensate for low (cold) water temperature. Temperatures can affect the incoming water pressure to the RO unit. Cold water can lower the feed water pressure and warm water can increase the feed water pressure.
  • The rated gallon per day (GPD) flow rate for each RO model is based on 60 psi input water pressure at 77 degree F water temperature. For instance, at this standard water pressure and temperature, the RO-45 (36-45) GPD system should make about 1.8 gal of filtered water per hour, so the 4-gal tank should be filled in about 2-3 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).

If the issue was not addressed, please contact us at:
800-880-4808, or
techsupport@freedrinkingwater.com

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