Bought in anticipation of buying a brand new Karcher K7, I still wanted to test the filter on my old K580. Well, yes, even tap water contains small grains of sand. Without totally dirty the filter is well noted that it retains impurities (after the first observation within 10 min of use) and therefore it has its uses. While I think that the motor of a Karcher is less demanding than the injection pump us valuable Diesel cars for fluid purity, one can only welcome that all this does not fit into the bowels of the machine. A therefore recommend for the purists who use drinking water system and to impose on all those who use alternative sources of power
