Bundle includes: 2 pieces Bio-Foam, 6 pieces Ammonia Remover, 6 pieces Phosphate Remover, 6 pieces Nitrite Remover For use in freshwater and saltwater aquariums Replacement media for Fluval 307 aquarium filters Bio Foam and Phosphate Remover keep aquariums cleaner Ammonia Remover and Nitrite Remover help prevent fish loss