might have made a mistake I dont know if I can fix

[Nano]

dont have my receipt lol. figured sand was sand. meh. atleast I didnt buy a few $100 worth.
If I were to mix up say 10-20 gallons of water for a WC, siphon the sand into a pillow case or something then do a WC that would probably be sufficient hey? then just remove what ever else is stuck to the rocks with a magnet if I can?

Anyone want 40lbs of sand for free