Water-sealed liquid ring vacuum pump systems have always enjoyed a good reputation based on exceptional reliability, low maintenance and a very long field-proven record. However, they normally require a continuous supply of water when they run which can be costly when water and sewage costs are added. Field selectable and adjustable amount of partial water recirculation up to 95% without the use of heat exchangers and chilled water. This feature will dramatically minimize operating expenses without the added cost to the initial price, installation and maintenance.