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Is skimming through the upper sightglass fitting a waste of my time?
It sure feels like it is. This is the third day in a row that I've tried it. Each time, I started with a hot (but not boiling) boiler, removed the sight glass, and started skimming through the upper fitting with just a trickle of water. Every once in a great while I'll see a little glob of oil come out, but it's not often. Let it run for most of the day until water was clear...and the next morning, the sight glass is dirty above the waterline and the waterline keeps bouncing.
I have a plumber scheduled to come out and install a skim port for me. I'm hoping the larger diameter helps. Since the equalizer is directly in front of the skim port, the chances of me getting in there with a wand are slim.
Some background--the boiler is at least 20 years old. I have no idea whether it was properly skimmed when it was new--I'm skimming because the system has all new traps and some new return pipes this year. Sightglass develops a film above the waterline soon after cleaning.