Have thus the lines of my new 20-year-old caravan cleaned. Dan Klorix into the water tank .... once all rumgepumpt and let stand for 30 minutes. I'm really broken off from the faith .... the old black lines really were like brand new out of business. Afterwards rinse still beautiful long ..... not forget always nice to lift the caravan and great. The Weltallerbeste wife is otherwise a MONK in terms of cleanliness but dressing up now smooth the teeth with the water from the purified with Dan Klorix tank and pipes