Used when I first set up my 29 gallon sand based tank to allow the sand to settle quickly. I think it helped for the first few weeks I used it. However, after opening it after a few months of not using it, it was filled with gray sludge (I didn't look closely - it was gross) and I didn't trust it enough to use it in my aquarium. Suitable for immediate use. but not in the long term.
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