Keeping your boilder happy and running smooth is very important, specially for big factory or building that need lots of heat or hot water. Think of boiler like big engine, it needs right fuel and cleaning to work best. Boiler chemcial dosing like giving engine special cleaners and drinks. These chemcials mix in right amount, not too much or too little, add to water into boiler. This help stop bad stuff like rust and gunk build up inside. Rust make metal weak, gunk blocks pipes so boiler work harder and use more energy. So, add these chemicals is secret way to keep boiler healthy, safe and run efficient for long time. Smart to protect your money and always have heat you need.