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FEATURE: Highly porous structure produces better filtration capacity. Suitable for both freshwater and saltwater filters. Allows more oxygen to be dissolved in the water. Another main material of this product is natural clay, used for supplementing rich minerals and microelements which will be slowly resolved under certain conditions and be utilized by the fish. Free reusable media bag for easy handling Dimension: Size of bacteria house ball: 3/4"x3/4" (20mmx20mm) Size of media mesh bag: 12x10.5 inch Includes: Total 1 Gallon (2000g), 450-500 pieces Please note: Due to the nature of the product, we cannot guarantee breakage during shipment, even if it breaks, it will not influence the function of the product, and we will try our best to pack and ship.