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What would cause DE to leak back into the pool via the return lines with a 20-year-old filter?

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βˆ™ 2008-07-01 22:28:00

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Simple. The filter is very old. You can count on at least 5 to 7 of the 8 grids to be bad ( having holes or totally torn) in a filter that old. Depending on brand that could be quite expensive. But still cheaper than a new filter.

Ken

Its not always torn or bad grids, inside your multi port valve there is a gasket called a spider gasket, (bout 20-30 bucks) it seals off the different compartments and when it gets worn, the backwash compartment or others can LEAK over into the filter position compartment, there fore letting some dirty and clean DE go back out into the pool, Very easy to replace, and VERY inexpensive fix compared to new grids and manifold. good luck.

David

2008-07-01 22:28:00
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