BW is your pond for the most part round or kidney shaped? Bill Cody will tell you right away how many fusers you need and where depends on the shape or structure of your pond. You say you have 6, 8 inch fusers and 1, 12? Is the 12 all by itself? I think you have 2 setups with 3 fusers on each setup would be enough given you have the right equipment. Where does the 12 inch come into play? For winter?

My pond is 1 acre and I have only 2, 9 inch vertex fusers setup with a 1/3 HP GAST rotary vane pump fusers are at 9 feet. This takes care of my pond quite well. Course I don't have to worry about winter air. So mine are shut off at this point.

Bills got it right as usual I would rebuild and get some new fusers if need be. The fuser itself is not really that expensive. Just make sure they are fine bubble fusers. As asked above smaller bubbles move more water have more uplift which is what your looking for!

Good Luck and keep us posted,
RC

The only difference between a rut and a Grave is the depth. So get up get out of that rut and get moving!! Time to work!!