Highest quality materials used to make high-end aquatic supplies. Provide the best environment for your aquatic life with Danner products. 100% designed and made in the Usa with quality goods. Coarse polyester and foam offer biological filtration. Carbon impregnated media offers chemical and biological filtration, all offer mechanical filtration. For 950 GPH, 1200 GPH, and 1800 GPH pumps. Foam.