In 3/16 I change taps every year, every TEE and every 3/16 fitting in the line. That gives me the best sap flow. I also clean the tubing by pumping it to full and leave it there until mid fall, when I open it and rinse with potable water. For that I use calcium chloride, not sodium chloride, squirrels love the latter. I used to clean just after the season and repeat in mid fall, now I just fill the lines and drops, plug them shortly after the season and leave it full until mid fall.
Dave Klish, I recently ordered 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.