what is this???

[rebelmedic]

I have no idea how long they run them. They have several scattered around the edge of the big ponds.I believe they are only used in hot weather when no wind or rain for a few days that would naturaly add air to the water. I`d make a guess that maybe 10 -15 minutes in several locations would be enough

 

[Westonium]

</font><font color="blue" class="small">( Not to be ignorant but how long do you have to sit there and do that to aerate a lake that size? Why not have something that just does that all day long like in a fish tank? )</font>

I agree. I would have a bunch of these littered around

http://www.malibuwater.com/Windmills.php

Those things turn in the slightest of breezes. If you have heavy wind breaks - this method wouldn't work. The same company has their aerator available in electric form too.