The water is fresh. If high concentrations of phosphates for 5+ are of little use, but if there are few phosphates, and you need to leave the aquarium for several weeks, after very good changes, when the concentration drops below 1 without this miracle of chemistry and the fish do not feed and leave, then yes absorbs phosphates. I did everything strictly according to the instructions, you can use it, but not permanently, as money thrown into nowhere.
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