3. it is purely a cosmetic thing, but the delta looks filled when you fill it up- the others have that annoying "half-filled" look right after you fill them up......
This really bugged me about the AeroTank. So I found a post someplace that told how to really fill it up and it worked for me. Now when I fill up my AeroTank mega it looks 95 to 100% full.
You simply insert a Q-tip into the chimney from the drip tip side so that the puffy end of the Q-tip is blocking the chimney, then fill the AeroTank mega up to the very bottom of the threads where the base screws onto the tank. Then put the base back on the tank pushing the Q-tip down into the chimney and screw on the base.
Then simply pull out the Q-tip, turn over the AeroTank mega right side up and it will now show to be 95 to 100% full.
I know it's only an aesthetic thing but it makes me feel better if I'm going to go to the trouble of refilling my tank that it should at least look to be really close to full plus the added small benefit of getting that much more eliquid into the tank to last a bit longer during the day.