Time-tested Duraflow flapper technology provides frictionless sealing for longer service life. Fiber–reinforced polymer valve body is used for superior strength and durability, non-corrosion and UV-resistance. Super capacitor for keeping time of day during power outage Continuous service flow rate of 15.5 GPM with a backwash of 6 GPM Controller options include time clock, metered and electronic variations Optical sensor for precision cycle positioning Soft water refill for a cleaner brine tank