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Logical. I did notice a lot of crap comes off of it during its first few soaks. It gets into the air and chokes you out. I wouldn't want my fish swimming around in that.
Right? Trick is, you just need to soak it long enough. "Long enough" appears to be "more years than you are willing to deal with." The next move after "cat litter substrate" was "garden soil substrate" whereby people who will happily dip their plants in a 10% bleach solution for precisely 30 seconds were literally digging in fields and dumping it in with their cichlids.