Review on 🐟 Premium Biological Filter Ceramic Rings - 500g in Mesh Bag with Plastic Zipper - Rust/Oxidation Prevention - Ideal for Aquaculture, Ponds, Aquariums by Cz Garden by Marti Kordeliski

So far so good, just received my rings and put them in other mesh bags. Using a white bag for other biological media is beneficial. These rings sink into the bag and collect bacteria that kill nitrates and other harmful effects in your filter to reduce fish bioburden. If necessary, simply rinse in aquarium water. Can be used in a variety of ways in a rear or external filter. Here, folks, is a large bag of ceramic rings. Good luck keeping the fish.