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Why is it that every time I vacuum and run the filter, I have D.E. on the bottom of the pool an hour later?
It would be best to vacuum up the D.E. in the pool and then add D.E. if you know how much is in the filter after you do this. If you don't, then vacuum up the D.E., backwash the filter, and add approx. 80% of the total amount recommended on initial filter D.E. start up. Clean the filter grids well and look closely at them for any holes. The slightest hole can allow D.E. to go through the filter. Also, the manifold at the top should be examined closely for any cracks or holes. Lastly, check all pipes to see if their associated o-rings are ripped, torn or missing. Replace as needed
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