Juwel bioBoost is a aquarium filter accelerator for all fresh water aquariums up to 500 l. JUWEL bioBoost immediately activates new filter media and accelerates the filtration performance in your aquarium and reduces your aquarium's settling time. It promotes the vitality of fish and plants. Once placed under the filter floss, bioBoost will release more than one billion microorganisms in a very short time to ensure crystal-clear water in the aquarium. Change the bioBoost every four weeks to maintain ideal water conditions in your aquarium. Constant monitoring of the effectiveness and quality of the microorganisms by a well-known institute.