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Fat and grease is another common enemy for drains. It might be hot/semi liquid when it goes into the drain but once it hits the colder sections outside it quickly cools and solidifies. This is sticky stuff and attracts debris, building up over time. Google (images) 'fat berg' if you totally want to be grossed out! It seems to be a fact of utility life that ...


98% of the time the answer is no. It is a straight line from the bottom of your main stack. The drain hole is a branch off your main stack. This can vary though but this is the norm in the US.


Yes they can, especially in exposed areas. I've heard of sewage pipes freezing in the winter and backing up into apartments in NYC, with disastrous consequences, though the more likely culprit is something that was poured down the drain. You could always pour some boiling water down the drain to see if it would help.


Drain pipes are generally run below the "frost line" for the region, and should never freeze in anthing resembling a normal winter.


You only have to replace the wax ring if the toilet leaks. It's wise to replace it whenever you remove the toilet, though. It's not a matter of age, but the fact that a wax ring is intended to be a single-use item. They squish into place when you set a toilet, and that can't happen very well more than once. It's certainly possible that you achieved a ...

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