Premier Plants 8 Layer Pack of 2 High Density Filter Cotton Reusable Aquarium Filter nano gel free Aquarium Filter Pad For Fish Tank With Cuttable For Aquarium / Pond Filteration (50 x 11 Cm) 8D Is a improved water filtration pad offers smooth water flowing as well as an excellent filtering effect thanks to its delicate design with a high density 8 layer filtration and practical aquarium filter which have a reusable filter pad with a cuttable design. This 8 layer filtration is designed with eight layers of varying densities of filtering materials, your aquarium tank's filtering system will be swiftly built-up and will effectively filter the water in a efficient,effective,durable ways. This 8 D sponge is made up of a long lasting nano-bio sponge and a fibre bio sponge filter which are then secured by two layers of cloth with the highest level of accuracy and a ultimate two layer sponge with three-dimensional mesh which is made up of high temprature melt bonds with a quality of durable and non toxxic, safe. This 8 D sponge is used for various purposes like ewage tanks, tank filters, pond, reef tank, fish and vegetable symbiosis systems etc and suitable for both salt and fresh water.