Porous ceramic media for efficient biological filtration. Their surface area and pores are sized to accommodate bacteria necessary for biological balance and to remove toxic ammonia and nitrite. Hollow design effectively distributes water flow and allows massive colonies of beneficial bacteria to grow on and inside each ring, creating an ideal "bio chemical filter". They will not break down in the filter or alter pH or water hardness. Great for both fresh and saltwater aquariums

• Bagged in 5 free mesh bags. Ready to use filter bags, convenient to use with your canister filter or pond filter.
• These rings are made of porous ceramic material. The tiny pores and the surface of the ceramic provide large amount of area for cycle bacteria to colonize, creating an ideal "biochemical filter". The beneficial bacteria help remove toxic ammonia and nitrite from tank water.
• Hollow-shaped design allows water run thru and less likely get clogged.
• Package includes: 5 bags of Bio ceramic rings. 1 lb each bag.
• Ceramic ring size: 5/8"x 11/16". Mesh bag: 8"x 5.5".

Bagged in 5 free mesh bags. Ready to use filter bags, convenient to use with your canister filter or pond filter.Aquacity