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Premium-Zeolite with 50 micron grade, for every salt & freshwater aquarium. With a clinoptilolite content of approx. 90 % for the effective removal of pollutants or in case of other issues. Adsorbs ammonium / ammonia, before it is converted into nitrite and nitrate in the nitrification chain. As a result, the nitrate content can be reduced in a safe and biological manner. Existing pollutants (e. g. phosphates) will be effectively reduced and removed via the skimmer or filter floss. Ideal for problematic cases, e. g. with cyanobacteria (blue-green algae).