Superfish activated zeolite has a high binding capacity, it absorbs harmful substances and ammonia from the water to prevent algae growth and poisoning. It removes up to 90% of ammonia within 5 hours. Perfect for setting up a new aquarium.. Features. Active biding of toxic ammonia. High capacity. Optimal water flow. Ammonia removal 90% after 5 hours. Nitrite removal 90% after 8 hours