Abstract: A water treatment and/or irrigation system which includes a source of water under pressure, such as a pump, an optional filter that receives water from the pump and emits filtered water under pressure, a system of irrigation lines that receives water under pressure for distribution to a field, and a flushing system for periodically cleaning the irrigation lines and/or the filter. The flushing system has a pressure vessel that receives the water under pressure and periodically builds its pressure to a level in excess of the normal level of the pressure delivered to the field, followed by discharging the built-up pressure as sharp pulses separated by one or more short time intervals directed toward the irrigation lines and/or the filter to effect cleaning thereof.