Kind of strange, I mixed black sand and regular black rinsing one bag at a time in a five gallon bucket outside with a hose. Three rinses and there was not too much dust left but I poured out the bucket each rinse while the particles were still suspended. The black seemed to me to be the easiest to rinse. I've used two other colors, the regular and one other. I would never subject my drains to that dust though! All of my tanks cleared to near perfect within about 12 hours running canister filters and sponges.