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Enjoy an unlimited supply of safe, delicious, ultra-pure water with the Pentair 4-Stage High-Efficiency Reverse Osmosis System. This system is NSF Standard 53 and 58 certified and offers a massive reduction in countless drinking water contaminants including Lead, TDS, Chlorine, Heavy Metals, Pharmaceuticals, and Pesticides. Along with its high efficiency due to its 1:1 product vs waste ratio, the GRO-475B includes an effortless click-in-lock and color-coded cartridges for super easy installation and maintenance.