Superior Pump 91660 Tankless Water Heater Descaler Pump Kit, Deluxe 3.5 Gallon. This descaler Pump Kit is designed to clean and descale most Tankless Water Heaters. Complete kit includes 1/6 hp pump, 3.5 gallon pail with screw top lid, two 6 ft. stainless steel hoses and one 7oz pack of descaler powder. Superior Pump builds pumps that are truly built to last and are 100% factory tested. Superior Pump uses quality components including solid copper motor windings, reinforced thermoplastic and electronically controlled split capacitors. Pump included in kit is a Superior Pump model number 91016 1/6 hp oil free submersible utility pump. 91016 Pump will move water up to 1920 gallons per hour and includes a 3/4 in. garden hose adapter. This 1/6 hp pump is CSA certified and backed by a 1 year.