The Flow-Tech Home will dissolve existing encrusted lime scale that is present in your pipes. The rate at which this occurs will vary depending on the make-up of the scale and the amount of water flow in your particular home. During this descaling period it may be necessary to clean aerators, faucet screens, shower nozzles, water heater sediment filters and possibly mix valves. It is also recommended that you blowdown (drain) your water heater 6 weeks after the installation of the Flow-Tech unit.