The Sterilight Ultra Violet Water System S5Q-PA provides point-of-entry disinfection with a flow rate of 6.0 gpm (22.7 lpm) at a 30 mJ/cm2 dose, if a dose of 40 mJ/cm2 is required.) This modular system, incorporating our new Silverâ„¢ controller, is ideal for whole home treatment of a small home or cottage. Placed prior to the water heater, all the water in the home, including the hot water will receive disinfected water. For more info about the Ultra Violet Water System click here: http://shoplocal.ly/01zi5N