Marineland Bio-Filter Balls for all Magniflow Canster Filters and C-Series Canister Filters. The Bio-Filter Balls provide a large, multi-faceted surface area for the growth of beneficial ammonia-neutralizing bacteria responsible for biological filtration.

• Fits all Magniflow Canister Filters and C-Series Canister Filters
• Provides larger, multi-faceted biological filtration area for the growth of beneficial BIO-Spira bacteria
• Allows water to receive full-contact filtration with virtually no bypass

Sizing: 7/8" diameter balls. Compatible with Rite Size S and T filter cartridges.