Whitlam FLOW-KIT Flow-Aide Complete Descaler Kit Whitlam Flow-Aide System Descaler Kit has been designed to work in conjunction with isolation valves that provide 3/4" hot and cold service connections. If these valves have not been installed on your heater, then the heater must be disconnected from the plumbing and drained, and the Whitlam Flow-Aide System Descaler Kit must be connected directly to the cold and hot water connections. Whitlam Flow-Aide System Descaler is NSF approved and safe to dispose of in drains. Non-toxic concentrate certified to NSF/ANSI 60 for use as a cleaner in potable water systemsPerfect descaling solution to keep your Tankless Water Heater in good operationCombines Flow-Aide with one of our Isolation Valve Kits making the descaling process quick and easyNon-Corrosive, Non-Toxic, Fully Biodegradable*, Safe to Handle, Zero V.O.C.Includes: (1) - 3.5 Gallon Bucket(1) - 350 GPH Pump(2) - 5 Foot Rubber Hoses(1) - Quart Flow-Aide