FUNCTIONS OF VALVE POSITIONS VALVE SETTING FILTER BACKWASH RINSE WASTE CLOSED RECIRCULATE WINTER FLOW DIRECTION THROUGH VALVE PUMP - TOP - THROUGH FILTER - BOTTOM - RETURN For normal filtration and vacuuming pool through filter. PUMP - BOTTOM - THROUGH FILTER - TOP - WASTE For reversing flow for cleaning filter. PUMP - TOP - THROUGH FILTER - BOTTOM - WASTE For initial start-up cleaning, plus resetting filter bed after backwashing.
