Product Description Slim Filter Series Activated Carbon Filter for Silent Flow Slim Adsorption power of activated carbon. Activated carbon absorbs nigori, yellowing, and odors. Quickly make breeding water Easy to clean: Keep your hands dry and get dirty, and you can easily replace them one at a time. Replace once every 2 weeks. The dirt on the filter material may differ from the filter size, the quantity/size of the fish, water quality, etc. Compatible models: Slim Filter SS/S/M/L, Aquarier, Glass Terrier AGS, Silent Flow Slim Filtering Material Size (W x D x H): Approx. 2.2 x 0.6 x 5.3 inches (5.7 x 1.75 x 13.5 cm) (per piece); Contents: 6 pieces; Caution: This product is only for ornamental fish. Do not use for any other purpose. Immediately after set, black powder may come out from the filtration, but this is the activated carbon powder. No bio-impact When using chemical such as fish diseases, please be aware that activated carbon in the filtration material adsorbs the active ingredients of the chemical and will lose its effectiveness.