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JAPANESE KOI MATTING - AQUARIUM JAP MAT Available colors: Green, Blue, & Blue Green - Japanese matting has been a very popular filter media in ponds for years and is widely used in koi ponds. - It has a huge surface area and is very effective at removing solid waste as well as allowing large volumes of filtration bacteria to grow on it. - The best way to use this is in layers with thin dividers between each layer to allow water flow. - Great for vortex filters, multi-chamber setups, or even black box-style filters.