Utilizing activated carbon, this specialized filter helps improve breathability against odors and pollutants. The highly porous particles create a greater surface area to collect and trap particulates for increased absorption and cleaner breathable air. Hand-built using the finest materials available today, each Green Filter starts witha multiple layer breathable mediacombined with a unique filtration technology resulting in a superior filtration system. All Premium Green Filters trap the smallest dirt particles that ordinary cotton-gauze “performance” filters can’t capture. FULLY WASHABLE These filters are built durable to last for a long time. Each filter body is 100-percent washable and reusable Clamp-on design comes with a replacement hose clamp to secure the filter to the 3" MAC1 orMAC3.2 Pumper intake. Fits MAC1 or MAC3.2 Pumper System only.