How to Backwash a Pool Sand FilterUpdated 9 months ago

How to Backwash a Pool Sand Filter

• Turn off the pool pump
• Set the filter valve handle to the ‘Backwash’ position and ensure the handle locks in place
• Turn the pump on and backwash for 2 minutes or until the water in the sight glass (located on the filter) is running clear
• Turn off the pump
• Set the filter valve handle to the ‘Rinse’ position and ensure the handle locks in place
• Turn on the pump and run the rinse process for 1 minute or until the water in the sight glass is clear
• Turn off the pump
• Reset the filter valve to ‘Filter’ and ensure the handle locks into place
• Turn on the pump

All sand filters use the same basic mechanics: when set to ‘Filter’, water flows from the pool, through the filter, and back into the pool. The sand inside the filter system blocks debris, dirt, and oil. A typical sand filter multiport system has 6 different settings – ‘Filter’, ‘Backwash’, ‘Rinse’, ‘Circulate’, ‘Closed’, and ‘Waste’.

Tom has made a video with an overview of pool sand filters here and how to properly operate the handles on the multiport.