Prefilter/Postfilter

Note: The pre-filter and post-filters are replaceable sediment and activated carbon cartridges located in stages 1,2 and 4. It is recommended to replace stage 1 and 2 every 6 months, stage 3 every 2-5 years and stage 4 annually.You may need to replace more often with high water usage or high sediment level. Replacing these cartridges
timely will protect the RO membrane from high levels of chlorine and/or sediment. As these filters build up with sediment, you may notice slower water output.

RO Membrane Cartridge

The RO cartridge is located in stage 3. This membrane is a spiral wound membrane which reduces the dissolved solids and organic matter. Cartridge life depends on pH and supply water hardness. Higher pH shortens membrane life by causing pin-hole leaks. If pH is higher than 8.0, cartridge life may be as short as 6 months. If pH is under 7.5, cartridge life may last up to 24 months. When output water quality and production rate decrease, it is time to replace the membrane cartridge. Lasts 2-5 years depending on incoming water quality.

Flow rate and output are determined by 3 factors:

1 Incoming water temperature

2 Total dissolved solids (TDS) present in supply water

3 Incoming water pressure

Lower temperatures are directly proportional to slower flow rate. All membranes are tested at 77°F. Incoming water temperature should not exceed 100°F. The RO Filter System should also not be installed in a
location susceptible to freezing. The more TDS in the supply water, greater filter time is required. Incoming TDS should not exceed 1000 ppm.
Higher water pressure enables a higher flow rate. Pressure must be above 40 psi for proper system operation. You may consider installing a permeate pump or booster pump if your pressure is below 40 psi.

1 Remove 1/4” drain tube from bottom of membrane cartridge.

2 Remove the pre-filter cartridges by turning each to the left and pulling down to first relieve pressure on
the RO filter.

3 Turn RO filter to the left while pulling down and remove.

4 Remove post-filter cartridge by turning to the left while pulling down.

5 Discard cartridges.

6 Install new cartridges in reverse order turning to the right to secure:
4 – Post-Carbon Block Cartridge
3 – RO Membrane Cartridge
2 – Pre-Carbon Block Cartridge
1 – Sediment Cartridge

7 Install 1/4” red tube into fitting at bottom of membrane cartridge. (Do not remove (I) flow restrictor)

8 Purge RO Filter System as outlined in Step Eight of your manual.