As a novel component for water industry covering residential, commercial and industrial applications, composite pressure tank is an ideal water treatment loading container and reaction container with excellent electrical insulation, corrosion resistant and heat insulation performance. It is most commonly used as the core component of purification and softening machine. If filled with various kinds of filtration media, composite pressure tank could be used for preparation of softened water, drinking water, pure water or ultra-pure water for industrial applications. ASME, NSF and KTW certifications have been obtained for the products.