This product utilizes coconut shell granular activated carbon as well as the ceramic filter cartridge which can adsorb residual chlorine, limescale, rust and heavy metal ions in water. It has passed the SGS, NSF, CPC and other industry-related certifications. This product has the capability to treat tap water directly. It is pretty easy and fast to operate. The test value of TDS and residual chlorine after filtration is measured by a precise instrument, and an obvious change occurs. It has proven that our product can meet the national standard for drinking water.