I've never had a problem with Flourite. My wife's 25 gallon and my 48 gallon both have it. I rinse half a bag at a time in a bucket, five or six times, and it always comes out (mostly) clean and there's never any dust in my aquariums. I even spent some time sifting it to use the smaller bits for a nano aquarium and never had any dust with it after rinsing it thoroughly. I hope the blasting sand works out well, seems like the best tanks here use it! It's certainly cheaper, which is great.
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