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Steam boiler clogging repeatedly
I have a residential steam boiler. I get it serviced annually where my plumber cleans out the sight glass and key components, skims the water and puts in the green additive in the water. The issue is that a few days later, the water sight glass is already clogged up and the water level is not able to be monitored properly. Additionally, the other components clog often throughout the year and at times the unit shuts down. It appears that the tank must be full of sediment or rust. This seems to stem from an issue a few years ago when the unit was way overfilled and I think that all of the gunk from my pipes in the upstairs of the house may have washed down into the boiler (my speculation). Bottom line is that I am in an endless cycle of pain here. How can I completely flush out the entire unit and all of the pipes in the spring and basically start new? Is there a process for this or directions somewhere? Appreciate all of your collective support!