I sent my wife to pick up filter sand from lowes, she came back with 4 boxes of Aqua Chems filter sand PLUS, it stated that it filters particles 10x smaller then ordinary filter sand, and that you use 1/2 of what the filter calls for(ie mine is 150lb sand, so i would use 75lb of this stuff). Im the type that if it calls for sand, you use sand, and if it says 150lb you use that much...but since she bought it, I wanted to check and see if anyone had used this stuff and what they thought about it...if its good, i'll try it, but at $22 for 25lbs, i wana know that it works really good, vs $10 for 50lbs of the regular stuff. Thanks for the help folks!