JBL Carbomec activ is a highly activated filter carbon used to remove any residual medication, discolouration of the water and high molecular organic pollutants from freshwater aquariums. JBL Carbomec activ should only be used for a short length of time (max. 2 weeks) to remove residual medication or discolouration in freshwater aquariums. In freshwater aquariums, activated carbon should not be permanently used as a filter substance as beneficial substances such as protective colloids or nutrients found in modern aquarium fertilizers (JBL Ferropol) will also be absorbed.JBL Carbomec activ+ adapted for use in the freshwater aquarium using a special process+ pH-neutral and neutral conductivity+ no phosphates encouraging algae released into the water+ filters out discolourations and residues of medications fast+ packed in fleece bag, ready to use