SYSTEM MAINTENANCE Pre-filter/Post-filter The pre-filter and post-filters are replaceable activated carbon cartridges located in stages 1 and 3. It is recommended replacing these cartridges at least every 12 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 cartridge is located in stage 2. 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. 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 36 months. When output water quality and production rate decrease, it is time to replace the membrane cartridge. 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 Sow 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 Rlter time is required. Incoming TDS should not exceed 1000 ppm. Higher water pressure enables a higher Sow 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-Rlter cartridge Rrst to relieve pressure on the RO Rlter. 2 Turn RO Rlter to left and remove. 3 Remove post-Rlter cartridge. 4 Discard cartridges. 5 Install new cartridges in reverse order turning to the right to secure: a – Post-Rlter (Replacement Model Number: RO TLROC) b – RO membrane (Replacement Model Number: RO TWRM35) c – Pre-Rlter (Replacement Model Number: RO TLROC) 6 Purge RO Filter System as outlined in Step Eight. 13
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