SYSTEM MAINTENANCE Prefilter/Postfilter The pre-filters (sediment- stage 1 and carbon - stage 2) and post-filter (carbon - stage 4) are replaceable cartridges, and it is recommended replacing these every 6 months. 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 membrane is located in stage 3. This membrane is a tightly 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. When output water quality and production rate decrease, it is time to replace the membrane cartridge, typically after 24 months. 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. RO Cartridge Replacement 1 Remove the pre-filter cartridges first to relieve pressure on the RO filter. 2 Turn RO filter to left and remove. 3 Remove post-filter cartridge. 4 Discard cartridges. 5 Install new cartridges in reverse order turning to the right to secure: a – Post-filter (stage 4) b – RO membrane (stage 3) c – Pre-filter (stage 2) d – Pre-filter (stage 1) 6 Purge RO Filter System as outlined in Step Eight. 13
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