OASE Replacement Filter Cartridge for the BioStyle Filter (4 Pack) bioplus thermo 50 There are five total stages

There are five total stages of filtration–mechanical

giving it a rich golden appearance

Formula made without added sugar

6 L) every three days (alternatively

OASE Replacement Filter Cartridge for the BioStyle Filter (4 Pack) bioplus thermo 50 There are five total stagesThe Replacement Filter Cartridge Set of 4 for the BioStyle 20, 30, & 50 and BioStyle Thermo 30 & 50 5 in 1 Filtration The BioStyle Multi Stage Filter Cartridge provides 5 in 1 filtration which ensures clean, healthy, and clear water for your aquarium No Mess Maintenance The disposable filter cartridges are easily removed and replaced Contains four replacement cartridges that fit inside the chamber of the BioStyle filter. Quantity needed depends on the