Quote Originally Posted by mitchryan912 View Post
Would it be wise to re-use the old sand? I'm assuming that the previous homeowners used proper pool sand, as there is a bag of pool sand in our shed. Do I take that risk or spend $50 on new pool sand?
The bag of pool sand is probably new. If it looks green, I wouldn't use it. If it looks clean, it's only 50# so you'll need more. I would not reuse pool sand. I suppose it's possible, and, if it's clean, well, as someone pointed out, it's not new but millions of years old...still, if you can get new sand for a reasonable price (on sale for <$10/bag) it's cheap enough to replace it.

If the old sand is gummed up or full of long green tendrils, abandon it. Period.