Hayward makes a range of pool filters, and only some of these filters require backwashing. The filters that do require backwashing are often fitted with the Hayward Vari-Flo multiport valve. To backwash the filter, the valve needs to be turned to the "BACKWASH" position.
After backwashing, move the valve to "RINSE" to clear out all the debris. The multiport valve has six positions which allows for control of all filtering operations. The "FILTER" position allows for normal filtering and vacuuming. "BACKWASH" cleans out accumulated filtered material that reduces the effectiveness of the filter. "RINSE" is used after a backwash to clear all dirt after a backwash cycle. "WASTE" bypasses the filter and is used when the pool is to be drained or the water level lowered, or when heavy duty vacuuming is needed. "RECIRCULATE" also bypasses the filter but returns the water to the pool. "CLOSED" shuts off the flow from the pump to the filter, and "WINTER" protects the filter from winter freezing.