OASE BioStyle Disposable Filter Cartridges Disposable, 1ea/2 pk

The Replacement Filter Cartridge Set of 2 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 size of the filter. Each multi-stage cartridge includes a filter foam, chemical media mix, and filter fleece Stage 1: Filter Foam � 45 ppi filter foam traps debris and waste and offers surface area for beneficial bacteria Stages 2-4: Chemical Media Mix � Contains carbon, zeolite, and phosphate binder, that work together to remove odors, impurities, and harmful nutrients from the water Stage 5: Filter Fleece � Traps extremely fine debris for a water polishing effect Changing the filter cartridge � filter cartridge should be replaced after 4-6 weeks, depending upon aquarium size, number of fish and plants, and declines in filter performance Rinse cartridge with water before use � do not open the cartridge