Eheim classic 600 Black Activated Carbon Foam Filter Pads, 3 Pack FW Koi Weight-sensitive perches are calibrated to

Weight-sensitive perches are calibrated to collapse under approximately 2 oz

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Eheim classic 600 Black Activated Carbon Foam Filter Pads, 3 Pack FW Koi Weight-sensitive perches are calibrated toFine and coarse activated carbon filter pads for adsorptive filtration For adsorptive filtration also for removal of harmful chemical substances (chlorine, remains of medical treatments etc.) there are special activated carbon fine and coarse filter pads as a filter insert. Adsorptive filtration is usually only necessary in the start up phase of the aquariums or after use of medication. The filter media should only be used for a short time (ca. 4