Filter Bags are made of felt material, which has the advantage of providing three-dimensional filter media and offering both a surface and depth filtration effect, along with a high pore volume resulting in a low-pressure drop, a high flow rate, and a longer bag life. Filter Bags are available in different types of filter media with different ratings. Polypropylene filter bags offer a broad range of chemical compatibility and are suitable for many applications. Polyester filter Bags are suitable for high temperatures and are compatible with acids and petroleum-based fluids.