Pre-Filter & Post-Filter Cartridge Replacement 1 Remove pre-filter cartridge by turning to the left. 2 Remove post-filter cartridge by turning to the left. 3 Discard cartridges. 4 Install new cartridges in reverse order by turning to the right: a – post-filter b – pre-filters 5 Purge RO Filter System as outline in Step Eight. Drain Flow Restrictor The restrictor is vital for proper operation of the RO membrane cartridge as it keeps water flowing through the membrane at the proper rate ensuring the water produced is the best quality. It is recommended the restrictor assembly be periodically inspected to be sure it is clean and unrestricted. If service is required on the drain flow assembly, disassemble and reassemble as outlined in Step Six. 14
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