I just purchased a Karcher "eco". So I can enjoy my reserve of water for cleaning the Karcher. Excited as a kid, I cleaned the bottom courtyard fills and I arrived at the bottom of the tank. The filter has blocked the whole deposit. The water could not pass so there was grime. I watched the integrated filter Karcher and it is perfectly clean.
I recommend buying and I even recommend Karcher to slide one in each box. This filter is indispensable!