Sincere apologies for incorrect use of the word mix. Distribute/disperse would have been better.My point is that the water settles at the bottom of the tank shaking the wing would disperse it around the tank and your drain might not show any significant water.
indeed. Perhaps though you should read the manual for 182/206 with rubber bladder tanks fitted. The correct procedure is to rock the wings to move water potentially trapped in ripples in the bladder.