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If you have a 6 stage RO filter I am presuming that it is a 200 gpd one. You have 3 pre-filters vertically across the bottom. Usually these are lined up from right to left as:sediment filtergac filtercarbon block filterYou then would have two horizontal RO membrane canisters above followed by a final polishing stage resin canister. Is that the set up that you have? The resin filter should always be the final stage for your water purification.
GAC - Granular Activated CarbonGranular because its in grainsActivated because its prewashed in an acidic solution to prevent the pH risingCarbon because its made from plastic (and some black stuff)