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    Hayward W3S310S ProSeries Inground Pool Side-Mount Sand Filter

    Item # E3442 Manuf.# W3S310S

      Special Product Note: 2" Valve Filtration Area: 4.91 sq ft Design Flow Rate: 98 PM

      Oversized Delivery Please allow 7-10 business days for delivery.

      Large Hayward Sand Filters - W3S310S

      The Hayward Pro Series side-mount sand filter boasts Hayward-quality filtration technology inside a corrosion and weatherproof outer tank, made of a durable polymeric material. The W3S310S 30" Hayward sand filter ensures even backwashing and efficient flow, and the Vari-Flo™ multiport valve offers six options, or choose a Hayward slide valve for higher flow rates. (Valves Sold Separately).


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      • Customer Review
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      Hayward S310S sand filters feature air release valves to purge air trapped during the filtration process. With an integral top diffuser and 360 slotted self-cleaning laterals, this side-mount pool filter evenly distributes water over the sand bed before it flows to the underdrain assembly, resulting in balanced water flow for filtering and backwashing. The heavy-duty flanged inspection dome gives quick access to the sand and internals, while the large drain plug lets you easily drain the tank without sand loss. The filter's patented folding ball-joint lateral design makes it easier to access filter parts for servicing.

      • • Hayward S310S side-mount sand filter provides efficient pool filtration for up to 47,000 gallons
      • • Hayward 30" sand filter has Internal 2-in. piping for maximum water flow rates
      • • Underdrain assembly balances backwash and flow with 360-degree self-cleaning laterals
      • • Hayward sand filters include a corrosion-proof filter support base of injection-molded ABS
      • • Wide range of filter control valves, available separately. Valve Not Included, see options below

      Low Water Flow

      • Check skimmer and pump strainer baskets for debris
      • Check for restrictions in intake and discharge lines
      • Check for air leak in intake line(indicated by bubbles returning to pool)
      • Backwash filter

      Short Filter Cycles

      • Check for algae in pool and super chlorinate as required
      • Be sure chlorine and pH levels are in proper range
      • Check surface of filter sand for crusting or caking ( remove 1” of sand if necessary)

      Pool water won’t clear up

      • Check chlorine, pH and total alkalinity levels and adjust as required
      • Be sure flow rate through filter is sufficient
      • Operate filter for longer periods
      • Be sure Vari-Flo valve is set on Filter position

      Procuct Downloads
      Filter Sizing Advice
      To ensure proper filtration and a trouble-free season: Your pool's size (total gallons) should be equal to or less than the Maximum Pool Size listed for each of our systems. Maximum Pool Size is based on an 8-hour turn-over rate.

      Since our high efficiency systems completely turn over your pool water in less time than standard 12-hour systems, you save money by running your filter less!

      When sizing a replacement pump, Dr. Pool strongly suggests that you replace with the same size horsepower as your existing set-up! In most cases, up-grading horsepower shortens your filter’s expected life and voids manufacturer’s warranties.
      Warranty Products