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When I vacuum or add DE to my filter it washes back into the pool. I have changed the filter grates and rubber valves and I am still havung this problem.

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I had the same problem with my pool filter last year. Found out one of the plates that holds the filter "fingers" was cracked. They also tell me that one of the filter fingers can be torn. Usually it's one of the plates. What make and model do you have ?

Posted on May 28, 2011


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I think Brandon's answer deserves a little more time and a slight explanation... as I think it is Spot On!
Algae dust is usually "Already DEAD" algae!
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We here on this forum do not know what type of filter you have, But if you do have a "MultiPort" valve as Brandon suggested you turn to the "Waste" mode, you will not use the filter mode to vacuum, as this will only BLOW the Fine Silt like substance right back into your pool, spreading out into the water to be suspended turning your water cloudy if not green, until it settles, and once again you have a covering of Dead Algae Dust on the floor of your pool. But when the filter valve is in Waste mode, you will bypass the filter and the return line altogether and your vacuumed algae silt will be sucked up into the valve, and OUT the valve to waste. And just like that all of the algae dust is vacuumed out and did not Blow back into your pool.
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Tell me more please. . . .

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