Key Features Consists of a combination of Super Activated carbon and zeolite Removes dyes, impurities and ammonia from aquarium or pond water Superior biological filter media helps to produce crystal clear water with less algae growth Comes in a handy waterproof tub with a carry handle and comes with a free filter bag 1000ml Jar SuperFish Crystal Clear is a biological filter media for use in Aquarium and Pond filtration systems. Crystal Clear has a unique filter media that combines the properties of SuperFish Activated Carbon and Zeolite. The combination works hard to clean the water in your aquarium or pond filtration system The unique formula removes all coloration and ammonia present in the water and helps to prevent Nitrate and Phosphates. As the water is cleaned, the result is healthier water with less algae growth. The Crystal Clear comes in a waterproof tub with a handy carry handle and comes complete with a free filter media bag Replacing filter media on a regular basis