... Sand Filter Sand Filter, Pool Sand Filter, Pool Filter, Side Mount Sand FilterSide mount fiberglass sand filter, the internal surface ... resin which is chemical resistant, the outer surface are designed by precise winding machine, allows the UV resistant. They are ... Six Position)Filter (Normal Filtration and Vacuuming)Backwash (Cleaning filter by reversing the flow)Rinse (after the backwash to flush dirt ...