While Dr Tim might tell me this is a poor practice, when I drill a tap hole, I break off a small stick from anything close by and clear the taphole, never blow in it to clear it out. I think doing that minimises the chance you will have debris in the hole to clog the CV. I used a new twig on every hole, there seems to most always be a dead twing nearby to break off to clean the hole. I also prefer tapping when the sap is flowing, to help push the debris out too, however when I had my most taps I was trying to be finished tapping before my 3 college students had to return to school, so the sap was often not flowing. As I got to have fewer taps, i did tend to tap during a warmer day and the sap was often flowing, sap flow will help push that debris out. I used CV spouts or CV adapters every season after the first year they were available, I don't think I ever had a 4%+ plugging issue, maybe a 1% max was about it.
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.