These are photos of a mud pond aerator that uses airlifts. It replaced a $1300 Great Lakes system that was extremely energy inefficient and had problems icing up in cold weather. This system including a 40 liter air pump cost under $150 to build and it circulates the water better using 75% less energy. This is the third one of these I have built. In identical ponds side by side last summer one of these was tested against the Great Lakes unit and circulated blue dye to a uniform color twice as fast. It is made in a sled design so it can be pulled into the water and back out without a boat. The air pump is underground in the blue barrel. A snorkel provides the air and the air line is buried below the frost line. I still need to make an insulated lid cover. So far passed -11 with no problems.