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The first step to clearing the air in a line is to locate the cause. This is usually a blockage in either the drain or the venting system. Once you clear the issue, flush the system by actually flushing the toilets repeatedly. This should allow the trapped air to escape, thus clearing the lines. Don’t be surprised if there is increased bubbling as the air makes its way through the system. 

The lifespan of a toilet can vary significantly. While the porcelain body itself can last up to 50 years or more with proper care, most plumbers suggest an average functional lifespan of 10 to 25 years, and many homeowners replace their toilets after about 20 years.

A toilet's longevity is influenced by factors like maintenance quality, hard water buildup, and damage to the finish. It's also important to note that internal components have much shorter lifespans than the bowl; for example, flappers may last only a few years, while fill valves can last around 10 years.

Even if an older toilet is still functional, consider upgrading to a high-efficiency model to save on water costs.

Brown stains in your toilet bowl are most likely limescale. Limescale happens from lime being left behind from hard water evaporating. Once dried out, the minerals also catch dirt and bacteria which eventually accumulate into the brown or blackish stain you see in your toilet. To remove thick and hard limescale from your toilet, use a mixture of vinegar, lemon juice, and baking soda, and scrub with a metal scrubbing brush.

You can pour bleach down the toilet as long as you dilute it since undiluted bleach can damage your toilet bowl. If you choose to use bleach to remove stains from your toilet, mix every cup of bleach with a gallon of water. You should also follow safety precautions when using bleach, like working in a well-ventilated area, wearing gloves, and never mixing it with any other cleaner.