STANDARD FEATURES The Industrial Steel Tank Automatic Water Softener (SF-100S Series) softeners are designed as fully automatic units either with timer or meter control. The timer control initiates softener regeneration at any predetermined time - on any or every day. The metered models start regeneration based on the total gallons used. The steel mineral tank is engineered for a 100 psi working pressure and is tested to 150 psi. It is equipped with a manhole in the upper dome. The interior of the tank is coated with epoxy for protection against rust and corrosion. The exterior has a rust inhibiting primer coat. A premium grade sulfanated nonphenolic polystyrene type resin is contained in the mineral tank. The resin will deliver 30,000 grains per cubic foot when brined at a rate of 15 lbs. per cubic foot. The brine tank is a combination of high density polystyrene brine measuring tank and a brine valve, including an air eliminator valve and a safety brine refill shut off to prevent tank overflow. The automatic regeneration controller features a choice of 7 or 12 day calendar wheels. Time of regeneration and length of time for each regeneration cycle are fully adjustable. The under drain utilizes either a hub & lateral or a header & lateral system to evenly distribute water and prevent resin loss, and to insure minimal pressure drop at peak flow rates.