Water Treatment Bio-Cide Code: A637 Tower-Cide Code: A630 Loop Treat Nitro Code: A1983 Loop Treat Poly Code: A1984 Tower Treat "H" Code: A1933 Tower Treat "S" Code: A1935 Alka Treat Code: A1965 Boiler Complete Treat "H" Code: A901 Boiler Complete Treat "S" Code: A1960 Boiler Treat "H" Code: A903