When used with municipal water, each filter has a maximum life of 12 months or 30,000 litres. The Waterdrop Direct Connect Untersink water filtration system uses innovative multi-stage filtration. And it can effectively reduce the chlorine, heavy metals, chemical pollutants, sediments and other large particles. Enjoy healthy and pure water directly from your tap. The system should only be connected to a cold water supply. The entire installation process takes less than 3 minutes. The twist-and-lock design ensures you can replace the filter in 3 seconds. It includes a 3/8'' hose with a direct connection that adapts to standard 3/8'' feed water valves.