experience. Warm reminder: The pre-filter is installed at the cold water of the water heater. It can filter and purify the water from and protect the water heater. The water heater generates hot water by heating cold water in the inner tank. If the water quality is not good and contains sediment, particles, etc., after the inner tank is heated to high temperature for a long time, it is easy to produce scale and cause blockage, which may not only cause damage to the water heater, but also affect the shower. Filters sediment, red worms, algae and other impurities to double protect washing machines, , smart toilets, etc. Pre-filtration, anti-scaling and purification of every drop of bath water. The pre-filter can filter most of the large particles and impurities in tap water and extend the service life of water-related appliances.