Booster pumps The booster pumps from Kärcher are ideal for supplying your house and garden with well water, groundwater and rain water. Any home owner knows that water is becoming more and more expensive. So why not use low-cost water from alternative sources? High-quality booster pumps from Kärcher offer a solution for every application. Well water, groundwater, rain water and spring water can be used perfectly well in the washing machine, to flush the toilet and to water the garden. The result: a reliable supply of reclaim water – and a good conscience.