I bought the Britta water filter because bother me for a long time at the tea making these deposits on the surface. Now have cooked my first tea immediately after the start-up, and am pleased, nothing floats on the surface. But I was very skeptical. When inserting the cartridge, there was no "click", despite repeated attempts, and somehow running water to the cartridge over and is down in the filter ... I have the manual thoroughly studied, carried us all as described, but the result is always the same. Even if I turn the cartridge back and forth seems to be the same (above and below I have not logically changed). Is there maybe a trick? Taste Well, the water, the tea is good, but not Weil is quite OK, there's just only four stars.