This video is of the modified cell in action. I modified it by doing 2 notches at the top, plus a notch on the inside tube and also it is offset of the outer tube on the top and bottom. Keep in mind where I weld the wire, on the complete opposite sides to get a full "contact patch".
As far as performace difference I did notice the modified tube did expell more solid bubbles vs mist of the standard design.
The purpose of the modifications was to encourage waterflow in certain directions and to increase its velocity.
(http://i75.photobucket.com/albums/i283/carbednotch/DSC02362.jpg)
(http://i75.photobucket.com/albums/i283/carbednotch/DSC02368.jpg)