I am pretty sure these are all blue and no bleach
The water in the toilet turned bluish, but there was no scent difference, and after less than a week, there is the same algae growing in our toilets.  With Clorox bleach tabs (to which these were a substitute as Amazon was out of stock)  The stuff would not be growing back for 3 months per tablet.  To me, these are just blue water tablets... I see no benefit to using them.
Rating: 1 stars