Yes, it does come out of the filter when you backwash.
You want to add enough to raise the pressure on your filter by no more than 1psi. When I add it to my sand filter, I have found that the rise is not immediate like you would expect. The first few times I added it, since I didn't see the immediate rise, I assumed I hadn't added enough so I added more. And, then it was too much and my pressure went too high and I had to backwash it out and start again. I tell you that so you will know to go slow with the DE additions and then wait several minutes to see how it will affect your pressure before you add any more.

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