Retention reservoirs require regular removal of sedimenting impurities; this also applies to channels, especially those with a low slope, carrying water at too low a flow velocity. An economical and convenient solution is the use of automatic flushing systems in tanks and simple flushing devices in channels. The applied system of automatic flushing of HYDROSELF retention tanks uses the energy of sewage accumulated in open accumulation chambers separated in the tank. The wall separating the chambers from the rest of the tank is equipped with hinged gates and non-return valves. The calculator in four simple steps allows you to quickly select flushing systems for retention tanks and channels, as well as download drawings, installation cards and diagrams of the selected system.