The Filter Pro 1" White Fine Filter Media is custom designed for use in aquariums, ponds and other outdoor water gardens. It can be cut to any size for multiple filtration applications. The custom fiber weave design filters out unwanted debris and contaminants for crystal clear aquarium or pond water and provides an immense surface area which is ideal for beneficial nitrifying bacteria. Our White Fine Filter Media removes small particulates from water, while still providing a high flow-rate required for oxygenating the large volume of water flowing through the filter systems or skimmer for your aquarium or ornamental pond. This means healthy pond water conditions, and healthy aquatic plants, koi and other fish! This filter media is extremely durable and is also reusable. It can easily be rinsed out and reused many times. Safe for freshwater and marine aquariums, ponds and water gardens. Made in USA.