Ceramic Bio Rings - Filter Media For Aquarium Fish Tank Filters  with free mesh bag
 
Great for your internal or external canister filter. Can be used in sumps as well to harvest all that lovely beneficial bacteria us fish keepers love.  
 
Premium porous Ceramic Bio Ring's provide a greater air surface for bacterial development and help decompose ammonia and nitrate efficiently.
Ring size: approx. 16mm, hole 6mm) 800 m2/L
 
The ceramic material will withstand any chemical reaction and is suitable for both Fresh and Salt water Fish Tanks and is perfect for use in Internal / External Pond & Aquarium filters.
Highly Porous.
Non-toxic.
High surface area to encourage the growth of nitrifying bacteria.
Reduces ammonia, nitrite and Nitrate. 
Can be used for both saltwater & seawater.
Long life rings that do not disintegrate like others in the market