These high pressure, oil-less air compressors are recommended for deep pond and lake aeration, forcing air through fine pore diffusers, overcoming friction loss on long air lines and other high pressure applications.
An auto-fill can help avoid a potential disaster when re-filling your pond. It makes maintaining a pond much easier and with an auto-fill you do not run the risk of forgetting to turn off the water. An auto-fill will automatically keep the pond water at the same level all the time. It is important to note that cheap auto-fills can pose a great threat. Buy a quality auto-fill, not a plastic one.