Aquaman finishes what he started by completing the PuROtwist 4000 installation with step by step instructions and detailed information useful for new installations and all RO system owners; including an explanation of air-gap vs. regular faucets, quick connect fittings, reservoir tank ball valves, reservoir tanks, quick change water filter cartridge installation, water line connections and water filter & reverse osmosis membrane flushing instructions. Aquaman is a Water Quality Association Certified Water Specialist.