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Check your local big box hardware store (Lowes) for a deal on DE. I just happened to walk by a big rolling cart with a sign that said 75% off. There was a sampling of old, dusty pool and spa chemical treatments -- not interested, and then I spotted these big crumpled, not quite new-looking boxes on the bottom. It said DE for DE Filters and contained 25 lbs. There had to be 8 or 10 boxes. I got one for $2.71. Should last me a good long time.
As long as I keep it dry, it should be fine, right?
I actually leave it in my outdoor pool trunk. Seems fine. I don't think water affects it much.
Our Lowes has quit carrying pool supplies. : ( - I just picked up 25# for $8.79 at KMart
The only thing that getting DE wet will effect is the amt that your measurer puts in - ie. a 1 lb scoop will have more than 1 lb of DE, it's become more dense.
you guys are lucky. in my area (maryland) the only place near me that sells de is the pool store and they charge 20+ dollars with a straight face.