Sand filter: bobbin winding fiberglass sand filter

Sand filter: 

   1:Drain: by-passes filter ,the water drained away directly.

   2:Filter: for normal filtering and regular vacuuming

   3:Backwash: for cleaning filter sand bed of accumulated debris.

   4:Rinse: used after backwash to flush valve

   5:Whirlpool : circulating water tp pool by-passes filter.

   6:Closed: shut off all flow to filter and pool