These physical water conditioners are a non-chemical alternative to protect against limescale in domestic water systems. 

Protects Against Limescale

HydroCare USA says its physical water conditioners are a non-chemical alternative to protect against limescale in domestic water systems. Unlike traditional water conditioners on the market, HydroCare is not dependent on the use of chemicals or water flow. HydroCare is fitted in the middle of the system and transmits a signal directly into the water 24 hours a day both up and down the system, making sure all of the water is treated all the time. HydroCare USA.