Learn from my mistake. When I first switched to sand from gravel, I used ordinary playsand. I washed it forever it seemed but still it was cloudy. Not knowing what I doing, I put it in my tank anyway and it was a nightmare, I couldn't get my water clear. Plus every little movement made more dust clouds. I asked some people about it and was told to use pool filter sand. I then removed all the nasty playsand and started over. I immeditately knew the pool filter sand was better when I put some in a bucket to wash it and it was practically already clean. It costs a few buck more per bag but well worth the price.