# That Thing in My Toilet tank (colors the water blue) **URL:** \ **Category:** Factual Questions\ **Created:** [December 24, 2008, 9:15pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595 "2008-12-24T21:15:33Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![ralph124c](https://avatars.discourse-cdn.com/v4/letter/r/8797f3/32.png) [@ralph124c](https://boards.straightdope.com/u/ralph124c)\ **Post date:** [December 24, 2008, 9:15pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/1 "2008-12-24T21:15:33Z")
…waht does it do? Besides coloring the water blue, does it have any other function? Dos it actually kep the bowl clean? Inquiring minds want to know! ---
**Author:** ![ChrisBooth12](https://avatars.discourse-cdn.com/v4/letter/c/e95f7d/32.png) [@ChrisBooth12](https://boards.straightdope.com/u/ChrisBooth12)\ **Post date:** [December 24, 2008, 9:28pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/2 "2008-12-24T21:28:08Z")
I think those are chlorine tablets. They are blue so you know they are in there I think? They are very toxic. ---
**Author:** ![Bear\_Nenno](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/bear_nenno/32/3358_2.png) [@Bear\_Nenno](https://boards.straightdope.com/u/Bear_Nenno)\ **Post date:** [December 24, 2008, 10:06pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/3 "2008-12-24T22:06:56Z")
Did you put it there? ---
**Author:** ![I\_Love\_Me\_Vol.I](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/i_love_me_vol.i/32/521_2.png) [@I\_Love\_Me\_Vol.I](https://boards.straightdope.com/u/I_Love_Me_Vol.I)\ **Post date:** [December 24, 2008, 10:26pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/4 "2008-12-24T22:26:28Z")
> [@ChrisBooth12](#): > > I think those are chlorine tablets. They are blue so you know they are in there I think? They are very toxic. I always thought they were blue because that’s the only color that when mixed with yellow or yellowish urine results in a pleasant color (greenish). ---
**Author:** ![Reply](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/reply/32/15952_2.png) [@Reply](https://boards.straightdope.com/u/Reply)\ **Post date:** [December 24, 2008, 10:28pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/5 "2008-12-24T22:28:31Z")
Mmm, toxic piss green! My favorite color ever. ---
**Author:** ![Shagnasty](https://avatars.discourse-cdn.com/v4/letter/s/9dc877/32.png) [@Shagnasty](https://boards.straightdope.com/u/Shagnasty)\ **Post date:** [December 24, 2008, 10:38pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/6 "2008-12-24T22:38:16Z")
They sell clear ones as well. I one moved into a place where the toilet had some serious internal coloration problems from lack of use for a long time. You couldn’t clean it fast enough. The tablets started fixing the problem away but it took weeks to get the full clean effect. I saw that they work just like chlorine works to keep a swimming pool clean. ---
**Author:** ![fortytwo](https://avatars.discourse-cdn.com/v4/letter/f/f9ae1b/32.png) [@fortytwo](https://boards.straightdope.com/u/fortytwo)\ **Post date:** [December 24, 2008, 11:19pm UTC](https://boards.straightdope.com/t/that-thing-in-my-toilet-tank-colors-the-water-blue/478595/7 "2008-12-24T23:19:27Z")
> [@ralph124c](#): > > ..waht does it do? Besides coloring the water blue, does it have any other function? Dos it actually kep the bowl clean? > Inquiring minds want to know! Do you live on an aeroplane? It could be Racasan. It’s blue, a detergent and its active ingredient is formaldehyde.