Last year I was messing around with the flavor wicks, I had them in for quite some time. In the end I took them out. my reasons were 2 things, one I felt like it restricted airflow slightly, also it seemed to get slightly darker then the regular wicks that were thru the coil, this might have been because my flavor wicks were separate, just on top. because of this wick not lasting as long as the rest of the set up it required changing out more often. at first I did find it to add a slightly better flavor but after a day it did the opposite. what I never tried was the flavor wick that actually ran into the juice wells, this might have kept it wetter therefore might have lasted longer.
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Mr. vapdivrr I don't post here to much but I am not sure if you remember a set of wick pattern's called the truman, with a wick over the top, and down in the wells? I was doing those for a long time, until just recently. I decided to try putting silica in the coil, and down to the wells, then I go over the top of the coil with cotton, and into the wells as well. I always had problems with silica wicking right, and wanted to try this, so I could dry burn, and still get the flavor of cotton. I think I get about 4 tanks out of each, maybe 5. I just wick it with silica then put the tube on, and put the cotton over the top, I have 4 set up this way now, I just thought I should share.
KAS