It won't hurt to replace the sand, but it probably isn't necessary. I'm on my 10th year with the same sand and I know there are others with even longer time frames with their sand. You should be able to find DE locally. I think Janet even said that she found it in her local Wal-Mart. Certainly a pool store will have it and maybe Lowe's or Home Depot? Buy the smallest container you can which will most likely be 10 lbs. Good luck. Keep us posted how it is going.

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