Quad Mix Media Pillows offer a special blend of filtration media designed to remove pollutants from storm water. The pillows can be used as an upgrade to existing storm water filters. They can also be used as a replacement for Poseidon Storm Water Filter pillows. Quad Mix Media Pillows are also an option as a stand-alone filtration pouch to be placed anywhere there is storm water flow. Prices range from $49.00 to $73.00. If you find a lower price, ask Spill911 about price matching. Call 800-474-5911 for more information. Spill911 is ready to help and answer your questions.