1 Answer

You need to backwash only when your pump pressure is 15 or 20 psi above the normal pressure rate.To backwash

Turn OFF the pool pump.Turn pool control handle to "backwash"Turn ON the pool pump. Watch for the dirty water to flow until it becomes clear. (Most filters have a clear bubble on the side that allows you to see the water as it flows out of the system)Turn OFF the pool pump.turn the handle to rinsestart the pump again for about 10 seconds or until the water in the bubble is clear.Turn the pump of again.Return the filter handle back to the filter position.Start the pump up againcheck that the pressure in the gauge has dropped considerably and if it has you once again have a clean filter until the pressure builds up again.

Note : When you backwash a filter, you drain allot of water from your pool.

Source :http://wiki.answers.com/Q/How_do_you_properly_backwash_a_pool