2.5"x20" Tankless & Traditional Water Heater Systems SKU: BG-SDSL25B Water Treatment Systems * A 5-micron sediment filter and special scale inhibitor to prevent minerals from sticking to the tankless water heater exchanger and other parts. * A water treatment system with a silent guardian to alert you when it's time to change the filter (pressure differential gauge takes the guesswork out of filter changes). * System is installed at the point-of-entry into the water heater. * 2.5" x 20" filter cartridge system with a 3/4" inlet port, up to 9 gallon-per-minute flow rate, approximately 25,000 gallon capacity (depends upon water quality), pressure release button and built-in bracket.