I think it doesn't do anything more than what the others do. The color needs to change. It's a color that's almost brown and doesn't make a nice combination in the toilet, and you instinctively want to flush the toilet immediately.

It is very good, it loses one star because I don't like its smell at all. When it comes into contact with water, it changes color and becomes blue. It cleans perfectly! I used it to clean the shower and it worked wonders! I don't know if it is intended for this use, but it made it shine!