While Clorox Automatic Toilet Bowl Cleaner Tablets (Original) do a great job of keeping the toilet bowl as well as the toilet tank water super clean, the bleach is so caustic that the rubber flapper in the tank deteriorates badly.  So much so that the flapper has to be replaced yearly.

Why not make a Clorox 2- or Greenworks-type alternative tablet that can be dropped in the tank that does as good or almost as good a job for a shorter period of time.  While it is fairly easy to keep the bowl clean without the tablet, that is not the case with the tank water.  We have a top-of-the-line Toto toilet that is six years old, and over time, even with regular cleaning of the bowl, the tank water turns brown.  This also is true for an older toilet by a different, unknown manufacturer.  Our plumber informed us that the use of the drop-in tablets with bleach voided the warranty on the Toto toilet.

Hope you consider my suggestion.  Thank you.

Mary