Aquarium Filters Oase

OASE BioStyle 20 is a sleek, compact power filter, ideal for marine and freshwater aquariums up to 20 gallons. This hang on back filter includes one multi-stage filter cartridge and one biological filter foam to ensure optimal water quality and clarity. The easy to see cleaning indicator lets you know when it is time to change the multi-stage cartridge or clean the biological filter foam. BioStyle filters are designed for easy installation, with an adjustable leveler foot for securing the filter to different thicknesses of aquarium glass and with a telescopic intake for varying aquarium heights The filter's built-in adjustable flow control allows you to change the intensity of water movement …

The BioStyle Multi-Stage Filter Cartridge provides 5-in-1 filtration which ensures clean, healthy, and clear water for your aquarium. Each Multi-Stage Cartridge includes a filter foam, three chemical media mix and filter fleece. These disposable replacement cartridges fit inside the filter chamber of the BioStyle Power Filter series. The filter cartridge should be replaced after 4-6 weeks, depending upon aquarium size, number of fish and plants, and declines in filter performance. Box includes two cartridges.