- Joined
- Mar 7, 2008
- Thread Starter
- #101
I don't know where it is from. I can only speculate, maybe I didn't flush enough? I don't think it should be from the premix, unless it is reacting with something left in the loop. The annoying thing is I'm not sure how best to clean it. Take the blocks apart? Or might a bit of reverse flow dislodge it?