I do not know if anyone of the other reviewer has ever ever seen after use of the dice in the cistern ?! The film never lößt to all but then swim all black film parts in there around that have a slimy consistency. Result in a normal cistern is it that you have to rid the dirt, because otherwise stuck at some point either the float or the water running after infinite because the pieces of foil to prevent a complete seal. But this is a conceptual problem, all manufacturers of these cubes have the same problem, have already tested different.
Otherwise, I can confirm the blue splash on the cover, but I have so far can be removed without problems. That does not necessarily meant that stuff for skin contact, it is high can inject the water is another drawback.
Since we have very hard water, I thought such a cube could limescale longer keep in check now I used more often he prefers a normal cheap toilet cleaner.
Visually the blue water is nice, but nothing more;)
