Advice for you after you buy what ever sand you choose: When you do the "hose and a bucket" approach, just as most of us do to clean it, make sure you take off any hose attachments you have on the hose. I dug mine down in deep in the bucket on full blast thinking I was the best sand cleaner in the world and ended up with a hose attachment that is stuck full of sand and won't budge. Trashcan time... Then wife even made me replace her favorite "car wash" attachment. (that she never used

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Just think of what it will do to the impellers in you filter, clean it well.