Rena API Bio Chem Stars - 20 Pack

API Bio-Chem Stars quickly establish the biological filter in aquariums, with 4 times more surface area than ceramic rings for rapid, massive bacterial colonization. They never need replacing and provide biological filtration to remove toxic ammonia and nitrites from your tank. 4X more surface area for massive bacterial colonization Quickly removes toxic ammonia and nitrites Never needs replacing, will not break down or clog filter Bio-Chem Stars are safe in fresh and saltwater and should be used for aquarium start-up and/or maintenance. Its never too late to start a robust biological filter and get your tank healthy! Specially manufactured from space-age polymers with a 50-70 micron internal pore network, they allow rapid oxygen and water transfer for maximum growth and health of beneficial nitrifying bacteria colonies. Why Bio-Filtration Biological filtration utilizes natural nitrifying bacteria to convert toxic ammonia into nitrate, a process known as the nitrogen cycle. These beneficial bacteria grow as your fish produce waste, establishing colonies on top layers of aquarium gravel or in biological media such as Bio-Chem Stars. Providing these bacteria with plenty of surface area on which to grow is an essential part of maintaining a safe and healthy aquatic environment. Directions: Remove Bio-Chem Stars from plastic bag and rinse thoroughly to remove any dust. Place in the last compartment of your filter. Bio-Chem Stars will become colonized by bacteria within several weeks. Using API Stress Zyme will help with the establishment of the biological filter.