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When you flush a toilet you are simply releasing the stored energy of the water held in the tank above it. Gravity does the work as the water from the tank fills the bowl, forcing it to drain. The water from the tank is dispensed around the inside of the upper rim of the toilet bowl. If that is the source of mold and odor, treating the bowl is not enough.

Turn off the water supply valve behind the toilet and flush. The water level in the toilet will then be low enough for you to use an anti-mold product, such as bleach, in a spray bottle to treat the underside of the upper bowl lip where the water comes out. Be careful and use recommended precautions to protect yourself from these chemicals. After giving the treatment time to work, turn the water supply valve back on to fill the tank. You may then want to put some of the chlorine product in the water tank as well and flush to distribute the chlorine treated water through the channels leading to the bowl rim. After that, avoid using the toilet for a while to give the chlorine time to work.

However, you may have another problem which was temporarily masked by putting chlorine in the bowl. You may want to investigate whether or not you have a leak where the toilet is attached to the floor. The toilet is sealed to a "closet flange" under the floor with a wax ring, or "donut" (yum yum!). If a leak is occurring at the floor as a result of the wax ring failing, you may never see the water as it is going down in search of the center of the earth. Along its way it will cause rotting floors and mold in the spaces below.

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Q: What would cause a mold smell from the toilet bowl if there is no visible mold and bleach in the bowl stopped the smell for one month but now it is back?
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Does bleach cause brain damage?

It depends if you're exposed to large amounts of bleach it could cause coughing, nausea, shortness of breath, watery eyes, chest pains, irritation to the throat, nose and eyes, and wheezing. If you are exposed to a large amounts of bleach it will not cause brain damage but may cause respiratory damage. If you where to mix bleach with other chemicals such as ammonia or if you where to swallow bleach you could risk getting brain damage. If you mix bleach with ammonia it causes a toxic gas. Ammonia is found in urine so mixing bleach and urine can cause a reaction which then causes a toxic gas to be released. To avoid this flush your toilet before putting bleach inside of it to clean. Also mixing bleach with other household cleaners can cause chemical reactions that also cause toxic gases. Avoid swallowing bleach as it can cause brain damage but worst it can kill you. Yes and No bleach can cause brain damage in some cases if you mix it with other cleaning products or ingest it. It will not cause brain damage if do not mix it with other chemicals.


What would cause everything to taste and smell strongly of bleach?

...Bleach.


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Water


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Yes, you can adjust the toilet clog to clause your toilet to overflow.


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No it can not.


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No, bleach and sugar water won't make an explosion but they'll cause a reaction.


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Iron in the water would cause rusty stains in the toilet.


Can the level of ammonia in your urine get high enough to cause a deadly gaseous reaction when mixed with toilet bowl cleaners containing bleach?

The first thing to understand is that you normally do not have ammonia in your urine. Ammonia is produced by the break down of nitrogen compounds, such as uric acid in urine, by bacteria. So, unless you have a major urinary tract infection there is no ammonia present. Any that is produced is pretty minimal. I think to get a high enough concentration to really cause problems you would have to collect a undiluted amount of urine, allow bacteria to do their thing for a while, then add bleach. Just peeing in the toilet containing bleach isn't going to do it.


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Do bleach tablets damage the toilet?

If you use the ones that go in the tank they will cause the flapper valve to wear out faster than usual. If you use the ones that are held in a clip inside the bowl above the waterline there should be no problem at all.