On all of my 3/16 I change all fittings every year, flush first. That seems to help move debris to the fittings, then change the fittings.
I tried Zap Bac and used them for 3 years but have decided to go back to CV2. I'm not scientific enough to be sure but fairly sure year 3 yielded less sap. Maybe it was just the season.
Mountain Van really likes them. Ask him what his cleaning method is.
Dave Klish, I recently bought a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.