Premium Rigid Black Pond Coarse Filter Media UNIQUE LATEX COATED FIBERS - Provides extra durability and strength to handle the heavy solid waste of outdoor ponds. Its open fiber construction allows for high volumes of water to flow through the pad without premature clogging while producing crystal-clear water. CUT-TO-FIT AND SAVE MONEY - Buying in bulk saves you money! Simply cut the Rubberized DIY filter to the right size you need for your outdoor filtration system. Custom cut-to-fit almost any pond filter, waterfall filtration, circulation system or skimmer. EXCLUSIVELY MADE FOR KOI PONDS - Our proven filter pad provides excellent mechanical filtration while providing important oxygenation for your ornamental garden pond. DURABLE AND REUSABLE - Our Custom Semi-Rigid and Durable Design resists warping, breaking, and tearing caused by leaves, twigs, and sticks. Easy to rinse clean with a garden hose and re-use many times. Perfect for Koi Ponds and Water Gardens! ENVIRONMENTALLY FRIENDLY - Completely non-toxic to all fish and other aquatic life. The latex reinforced fiber structure is 100% inert will not interfere with water PH levels. PROUDLY MADE IN THE USA for Aquatic Experts! Premium Rigid Black Pond Coarse Filter Media is custom designed for use in Koi ponds and other outdoor water garden applications. This extremely durable filter media material is lightweight, yet incredibly strong at 1 inch thick. Its interwoven structure is rigid enough to handle the elevated weight and quantity of debris that are associated with an open outdoor pond containing large Koi fish. It filters out the small contaminants to create crystal clear water. Our custom fiber weave design not only traps unwanted debris, but also provides an immense surface area which is ideal for beneficial nitrifying bacteria. Our Premium Pond Filter Pads are tough enough to resist damage from heavy debris such as sticks and leaves, while still providing a high flow-rate required for oxygenating the large volume of water flowing through the filter systems or skimmer for your ornamental pond. This means healthy pond water conditions, and healthy aquatic plants and animals! This filtration material is also washable and easy to clean with a garden hose. It can be easily rinsed and reused many times. Our Premium rolls can be cut into sheets to fit any size pond filtration system. Save money buying these bulk Koi pond rolls versus buying pre-cut pads. These unique pond filter mats are proudly made in the USA for Aquatic Experts.   Black Pond Filter Pad FAQ:Q: Can this take the place of the round tube filters I buy? If so, how would you faster it so it doesn't come loose?A: I am not sure what your round tube filter looks like or what it is made of. Our pond filter pad can be wrapped around a pipe and fastened with plastic cable ties. If you can provide more information about the tube filter we can better answer your question.Q: Is this similar to Matala media, can it be used in a marine aquarium sump?A; Our Coarse Pond Filter Pad is designed to be used in ponds. We have not tested it in marine aquariums. We recommend our FilterFirst True Dual Density Filter Roll for freshwater and marine aquariums.Q: Is this carbon coated?A: Our Classic pond Filter pad fibers are not carbon coated. The filter pad is black from a thick coating Of latex which gives it strength and durability. Since our filter pads will last much longer than carbon in a pond we recommend using activated carbon in a mesh bag which can be replaced on a regular basis.Q: My pond is under a tree, should I use both your black and white pond filter pad?A: Yes, have the water flow through our black coarse pad to trap leaves and larger particles then flow through our white pad to trap the smaller particles from your pond water.Q: Can it be cut with regular house scissors to fit inside my filter?A: We suggest you make a template Of your Old filter out Of cardboard then use the template and strong scissors or a utility knife to cut the pad.