new hayward s210t pro series top-mount inground swimming pool 21" sand filter

**We are an Authorized Hayward Dealer!**Hayward Pro Series high-rate sand filters offer the very latest in pool filter technology with smooth, efficient flow and totally balanced back washing. Pro Series sand filters feature unitized construction of corrosion-proof, polymeric material and self-cleaning 360? slotted laterals. A versatile seven position control valve offers both easy operation and maximum efficiency. For crystal clear, sparkling water with minimum care, Pro Series filters set a new standard for performance, valueand dependability.Sand filters are one of the most popular and cheap way to filter water. For good reason. They are simple, effective, and require very little attention. Pool water is routed through a sand-filled pressure vessel. In this method, impurities are extracted from the water using sand to collect and attract the debris as small as 20 to 40 microns. Over time, dirt accumulates in the spaces between the sand particles causing the pressure in the vessel to rise as water finds it harder to pass through. This signals you to "backwash" the filter. Simply reverse the water flow and "knock out" the dirt.