How to Backwash an Intex Pool Turn the pump filter off. Set the filter to back-wash. Connect a hose or pipe to the discharge port. Turn on the filter. Turn off the filter and set the filter mode back to its regular position. Disconnect the hose from the discharge port and store the hose. Click to see full answer. Just so, how do you backwash an above ground pool? How to Backwash an Above-Ground Pool Turn off the pool pump. Turn the valve to the backwash position. Turn on the backwash valve and let water run through the backwash hose for 2 to 3 minutes, or until the water coming out runs clear. Turn off the pump. Put the filter valve on the rinse position. Likewise, what happens if you don’t backwash your pool? You do a backwash out of a pool. If the filter is not backwashed dirt and ?? filtered builds up and if it dies not stop the water flow rhe dirt will be discharged back int ok the pool. A good way to tell when to backwash is watch for the pressure on the input side ti increase by a few psi. Just so, how often should you backwash a sand filter? As a rule of thumb, you should backwash and rinse your filter about once a week. The optimal time is right after you vacuum the pool. However, if your pool has had a lot more use than normal, it may be necessary to backwash twice a week.How often should a pool be shocked?Always make sure that the filter system is running while shocking the pool. Some pool owners choose to shock their pools once every 1-2 weeks as normal maintenance. This is a great way to keep your chlorine level up and prevent algae growth.