Unlike the other reviews I love these I prefer the blue coloured ones but there's not much difference, keep my toilet lovely and fresh helps stop limescale and definitely doesn't leave toilet patchy or at least didn't with mine.
Submitted by Maria
Just makes the water look dirty as it starts to fade, making it look like the toilet has not been flushed.
Submitted by Cliff
I now have a permanently purple streaked toilet. Can't get rid of the awful stains. Unfortunately I bought two packs.
Submitted by JJ