You should use RODI water, but I used sink water to clear up my sand with fine particles >^>... If you rinsed it, it probably doesn't contain much bacteria anymore, but it will cycle back. ^^ to clear up fogginess you could use a product called "clarity" it binds to the extra fine particles and makes them stick to your filter.
It worked wonders for me when my tank clouded up, but I haven't used it recently due to not wanting to loose bacteria in my filter.
Your sand will most likely act up when it's disturbed, but you could also buy a thicker filter pad, filter floss..? It looks like a piece of felt lol. It will also help pick up smaller particles.
^^ I've been dealing with my dumb fine sand for a while