LifeLine Air Pumps are the perfect choice to create and maintain a healthy pond environment. These quiet, low energy pumps enhance oxygen levels by helping circulate the water in your koi pond. LifeLine Air Pumps add oxygen to ponds during hot summer months when oxygen levels decline. In the winter, LifeLine Air Pumps help break down fish waste and prevent the pond surface from freezing over. Keeping a hole in the ice allows natural gases to escape.