Crystal steel inner tank Features: 1) Rust-free and scale resistance: the special silicide coated on the crystal steel inner vessel can separate water from steel plate, so it is featured with rust-free, high strength, and resistance to corrosion by chlorine ion 2) New technology and new material: a special silicide is coated on the inner vessel by the newest German process technic. After baked at 900C, it is melted and integrated with the steel wall of inner vessel, thus the crystal steel inner vessel with extra protective function is made 3) No seaming and leaking: crystal steel inner vessel is formed by integral drawing from special type thickened material, so the service life is longer