466-90319 - Marineland Bio-Filter Balls C-Series Rite Size S/T 90 pk

Provide a larger, multi-faceted biological filtration area for the growth of beneficial BIO-Spira bacteria. Fits all C-Series Canister Filters. The BIO-Filter Balls provide a large, multi-faceted surface area for the growth of the beneficial ammonia-neutralizing bacteria responsible for biological filtration.