Quote:
Originally Posted by Chironex
Although I haven't seen the stuff for swimming pools, I would imagine that it is much finer in granularity than the kitty litter sized granules in NAPA's "Super Absorbent". I would think too that the pool grade stuff is much more "washed" to prevent cloudiness in the water. We actually want the dusty stuff. It is the dust that goes into suspension in water that does the trick.
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I've read that much of the DE that's packaged for swimming pools is mined from marine sources and may have a high level of salinity. Most of the spill clean up types are mined in NV or UT (there are the great salt lakes there too....hmmm ....I had not considered this until now) and are used by some for hydroponics. Anyways, just some stuff I read ,worth checking into though.
I did look up the brand name on the ones I bought and went to their website to see where it was mined. Those are the two states I came up with. These could be ancient sea beds but, from what I read, I gathered that they were freshwater deposits.