The black discoloration that forms often indicates a problem with the water such as mold spores bacteria or minerals.
Black mold in the toilet.
If this is the case the mold will re establish itself every time you flush the toilet.
First flush the toilet and pour a cup of bleach into the bowl when the water begins to return.
Next using a scrubber begin to scrub around the toilet bowl and edges of the seat.
Black molds thrive in areas that have a higher exposure to sugar.
But if your toilet has good ventilation or fans that can make the air flow smoothly the chance of mold is pretty much low.
Black mold can create health problems for those living in the house especially if they have immune system or respiratory problems.
There could be cracks in the ceramic of your toilet.
You may end up scrubbing the black stuff off the toilet only to find that it has returned two to three days later.
The water in your toilet tank should be clear and free of debris or contaminants.
Rust on the pipes can also cause condensation which leads to black mold.
These cracks give black mold a place to stick grow and flourish.
A black ring around the toilet rim makes your toilet look unsanitary.
A toilet tank can provide the moisture mold needs to grow.
If you see black mold growth in your toilet you ll need to take steps to remove the mold and prevent it from returning.
The best method for removing black mold from the bowl is using bleach removers.
You could have black mold in the water supply from the pipes or tank.
The main black mold in toilet causes is the ventilation.