The proper grade sand is #20 silica which is. You must remove the sand from the filter and inspect the lateral / underdrain system and replace any cracked or damaged parts.The sand you are using may be too small, allowing it to pass through the underdrain system. The most common cause is a cracked lateral in the underdrain system. Turn the filter valve handle to Filter and restart the pump. This action removes any debris trapped in the filter during backwash. If you do not have a rinse position on your valve, set the handle to Filter and restart the pump.) Turn the pump on and rinse for 20-30 seconds. (Note: this setting is not available on all valves. If your filter has a backwash sight glass, backwash until the water is clear. Typically it will take 2-3 minutes to backwash the debris from your filter. Turn the filter valve handle to Backwash. Typically, a clean filter will run 10-15 psi, so backwash when the pressure is 20-25 psi. Backwash the filter when the pressure increases 10 psi above the pressure when it was clean. Over time, the effectiveness of the sand bed to remove particles improves. Excessive backwashing is not recommended. Do I have to backwash daily? How do I know when to backwash? We recommend replacing the sand every 3-4 years. Often if this has occurred, the sand will need to be replaced. If this has occurred, you can add a degreaser to try and loosen the sand. Over time, the sand in your filter can become calcified or hardened from chemical buildup. Follow the instructions for backwashing “How do I backwash my filter?” or refer to your owners manual or follow the instructions noted on the label located on the tank body.Ĭheck to ensure that no valves are closed in the return line to the pool and that there is no blockage in the return line. High pressure typically means that the filter sand is dirty and needs backwashing. Why is the pressure in my sand filter so high?
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