Chemical additive for boiler water

I just had Vigilante come to do the annual boiler maintenance. After draining and refilling the boiler, he said the water is a little dirty, like tea. He recommended adding a chemical to the water to keep it clean. I wasn’t there to ask, but I’m curious why the water would still be dirty. It’s an old boiler, could it just be years of build up on the inside? I’m inclined to listen to Vigilante’s advice. Any other opinions?

By cornetor | 10/31/2007 9:27 PM