Classic porous ceramic ring media — the workhorse biological filtration every tank relies on. The open ring shape keeps water flowing freely while giving beneficial bacteria a large surface to colonise, so they can break down ammonia and nitrite and keep your water stable. The open bore resists clogging and holds its flow rate over time. It's the dependable everyday biomedia, and it pairs naturally with our other ceramic media: run open rings where flow enters, finer and denser media further along, for the most complete biological filter. How to use Rinse in dechlorinated or tank water before use (never hot tap water — it kills bacteria). Place in filter compartments, canisters, or sumps with steady flow. Leave in long-term; rinse gently in tank water only if flow slows. No regular replacement needed. Details Volume: 500 ml (approx. 38 rings) Material: porous sintered ceramic Safety Inert, aquarium-safe ceramic. Suitable for freshwater and planted tanks, fish, shrimp, and invertebrates. Tested and used on the Plecoceramics farm.
