AquaFill/ Water Level Controllers WATCH VIDEO: (copy and paste link) http://is.gd/2PnMEe AquaMedia manufactures the AquaFill electronic water level controller rated "Fail-Safe" and is the #1 water leveler in the industry. There is a model for every conceivable water feature from ponds, pools and hot tugs to fountains, pondless waterfalls and water garden containers. There are many auto fill devices on the market today, however, most of them are mechanical floats similar to the toilet tank floats. Because they are a mechanical devices, they are susceptible to malfunctions such as sticking, jamming, rusting, warping or corroding. as a result of this, most floats stick or malfunction in the closed position, resulting in an unchecked, continuous flow of water, NOT SO WITH THE AquaFill.