not a stupid question; there's a lot to learn about pools:
http://www.homedepot.com/p/Pool-Time...2PTM/100071664
DE (diatomaceous earth)is a white powder that is the filter media for a DE filter. It is actually the ground up fossilized remains of tiny aquatic organisms called diatoms. You can buy it at a pool store. Just buy a very small bag and don't let them talk you into buying a bunch of other stuff while you are there! They'll probably try!
not a stupid question; there's a lot to learn about pools:
http://www.homedepot.com/p/Pool-Time...2PTM/100071664
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