REVERSE OSMOSIS ST-33 GAC STAGE 2
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Stage 2:ST-33 GAC QC Cartridge – Replace every 6 months – NSF 61
This quick change pre carbon filter which is made of granular activated carbon removes chlorine to protect RO membranes and absorbs harmful organic chemicals in feed water, the most important filter should always be a Carbon Filter to protect the life of the membrane.
This should then prolong your membrane life (the membrane is your most expensive and crucial component) for a life of up to 5 years (depending on location/water).