All the time. Do a seach on the threads. Poconos and I do it all the time. Start with adding 1/3 cup and wait. The object is to add just enough to increase your pressure 1lb. Add another 1/3. If you add to much and you start having problems with water pressure weak out the returns, just backwash and start again. You'll find that one 10lb box lasts all summer, easily, if not two--cheapest improvement you can make to your sand filter. I don't know that adding it to Zeobrite makes sense. Then again, I don't know why spending a fortune on Zeobrite makes sense at all when sand and DE are SO much cheaper.
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