The P3 P7920 Chemical-Free Water Conditioner helps to reduce limescale buildup in your water pipes. Limescale buildup can become as hard as stone, causing a decrease in water pressure and showerheads to spray water in every direction. Your pipes and appliances may clog with limescale deposits that may require expensive solutions to remove. Compact, cost efficient and maintenance free, the P3 P7920 Chemical-Free Water Conditioner slides over any water pipe. The P3 P7920 Magnetic Water Conditioner helps to reduce limescale buildup without chemicals by using state of the art high-powered ceramic ferrite magnets that polarize salt molecules in hard water and help break up limescale before it forms. This hard water conditioner does not contain any moving parts and doesn't require any batteries.