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This product is packed in 170g bags. This product is compatible with the Fluval U2, U3 and U4 filter. The very high surface area of this product allows for rapid colonisation and growth of beneficial bacteria. These are essential for breaking down ammonia and nitrite and are essential for good water quality in your aquarium. Please Note: This is NOT an original Fluval product. It is a Finest Filters compatible product manufactured to serve the same purpose as the original brand.