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Sand filters should only be backwashed when your pressure builds up 10-12 ppm over your start up pressure on your pressure gauge. For example, if your pressure gauge reads 10 ppm after you backwash, you should not backwash again until your gauge reads 20-22 ppm. Backwashing too often has a reverse effect on your pool filtration system. Your filter will work better when the sand becomes dirtier; it is able to filter out a smaller particle.
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