When you have a boiler system that does not require phosphonate, you can use
ChemWorld 1197 which is all polymer, sulfite, and amine. Since this is a one-drum chemical, you will need to test the boiler for water pH, sulfite, conductivity, and water hardness as reference. Also, in order to bid this boiler, you will need to boiler duty time, boiler hp, or total boiler water make-up. The condensate treatment listed above, is fairly straight forward.