where do you purchase sand for filters? I found pool sand on the web sites of both Lowes and Home Depot. But they don't have it in stock, can't or won't special order it, and neither will ship to home. But it is listed on there websites. I have heard their sacrete brand was not very good in any case. I have found it on line but they want around 12 dollars per 50#, and $23 to ship each bad. I have never been in a pool store, do they typically sell pool sand there? Thank for any help you can give.