Add some to a bucket, run a hose into it while stirring it up. Pour off the water and whatever floats to the top, repeat a few times or until the water runs as clear as you want it to. I wouldn't make it any harder than that.dhagans06 said:Hello Everyone im setting up another tank and im looking for an easy way to clean my crushed coral substrate to get all the sand and milkyness out of it. Is there any techniques that you guys may use to clean your gravel during the initial startup? Thanks!