... industrial 30"-63"diameter FRP water softening tank;water softener FRP tanks FRP tank for water treatment water softener,ion exchange,pretreatment ... FRP tanks have many different Models: 871-96126(upper and under openings and side openings), 2.5’’, 4’’, 6’’, 16 ... ’’, 18’’ flange.6. Accessories: upper and under distributor, black cock, multiport valves, central tube, resin, activated carbon ...