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Perhaps you have used the wrong sand or it is still blowing old sand out of the pipes.

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15y ago

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How do you get rid of dirt in a swimming pool without a vacuum?

This sounds as thought the laterals in your sand filter are worn. Laterals are horizontal spokes at the bottom of your sand filter with tiny holes in them that let water through but not sand. After a time the holes get enlarged and start allowing sand through and back into the pool


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How does a sand filter work?

A sand filter has laterals (plastic tubes with holes in them) in the bottom, covered with a foot or more of sand of a particular size grain. Pool water is flowed onto the top of the sand and vacuum pressure draws the water through the sand. The particles in the water are trapped in the upper level of the sand and the clean water flows through the laterals and back to the pool. As the dirt builds up on the top of the sand (the schmutzdeck) the filter actually cleans better. Once the dirt layer is thick enough to impede the flow of water, you have to remove it by backwashing. You do not want to backwash too often or you will lose the efficacy of the filter. Be sure to shut off the pump before you move the lever to backwash or you WILL crack the laterals - requiring a very expensive repair.


What is broken if you vacuum a pool and the algae gets shot back into it instead of being removed?

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