If you want to waste the sand, just wash everything down the sewer hole...
If you want to wash the sand, tap water is fine. Stir it in a pail till all the floating debris comes out. If you want to be kiasu, use a strong magnet wrapped in a plastic bag and use it to trap metal particles.
In future, pls spellcheck and no one will be able to misunderstand you!
ie. LSF, you mean LFS right?