I keep getting mold under the water in one of three toilets- help!

www.hometalk.com/categories/cleaning/household/toilets

Try cleaning your upper tank with clorox, and keep some sort of clorox/

cleaning tab in the tank.

The most common cause of mold in a toilet bowl is stagnant water. Stagnant water occurs when the toilet is not flushed on a regular basis. Additional causes include mold spore growth in the toilet tank. In addition, a particular strain of mold that is referred to as "slime mold" is extremely difficult to remove, even with the application of chlorine bleach. Slime mold is a specific classification of mold in which a slimy coating develops over the mold to protect it in certain environments. In order to safely remove mold from a toilet bowl, the entire colony must be eradicated. Mold colonies can be removed with a strong scouring pad followed by a double application of chlorine bleach in the toilet bowl and tank.....It's been said that diabetics experience mold growth in their toilets. It's been said by some that it is more of a northwest issue for diabetics, than it is for anywhere else in the country. It's also been said that this is something that happens to diabetics that have higher numbers. Some diabetics have had black mold popping up shortly after they began taking Invokana… which causes them to expel extra sugar thru urination! This feeds mold spores.

I thought that mold needs oxygen, and therefore can't grow under water? Maybe it's some type of algae growth.

I agree, try the upper tank with bleach, maybe try one or two times to make sure to get it all.

The mix of bleach and dish soap helps a lot.Just a couple drops of dish soap,and a cap of bleach!