Kasco water circulators are ideal for creating directional water flow in your pond or lake. This transforms still, stagnant water into a stream environment and helps add vital oxygen. Still, stagnant water promotes the growth of unwanted surface and bottom vegetation such as algae. By eliminating the stagnant water, the water circulators help limit the growth of the unwanted aquatic plants and keep your pond cleaner. Stagnant water contributes to rapid mosquito reproduction, including those that may carry the West Nile Virus. Creating a stream environment helps limit mosquito reproduction and thereby helps control the overall population of mosquitoes in your area. Kasco water circulators can be used to help prevent winter-kill conditions and protect permanent fixtures in your pond or lake. During harsh winters with thick ice and heavy snow pack, your pond can experience a fish die off due to low oxygen levels.