See the dirty water you are flushing out from your filter system. An indicator of when you should stop backwashing your filter to save good mature pond water. Unions are on both ends for easy installation and maintenance.
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.
