Fibertek brand fiber filter tank is made of PE plastic, high durability, good corrosion resistance , No leakage, light weight, easy to install, cheaper than stainless steel tanks and more durable. Can be used with either manual or automatic control heads. Highly resistant to 150 psi water filters, carbon filter tanks, resin, sand, manganese, Other filter media are filter tanks for containing different types of filter media. The outside material is made of fiberglass, the inside is PE plastic, resistant to corrosion. The filter tank is about 1 in 3 lighter than metal materials.