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Yes, yes, but the drainage efficiency of 75 pipes and 50 pipes is lower than that of 75 pipes.
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No, it's too fine! It takes a bit of effort to install 100-110 pipes. Once!
In principle, as long as the drainage pipe can be connected without leakage, it can be used, and there will generally be a hose connection, and it is generally not easy to use a hard pipe connection directly.
I haven't heard of vinegar that can solve the problem, if it is not completely blocked, just flush it slowly, and it is best to pour it down from a high place in a basin If it doesn't work at all, you have to find someone to dredge.
This size is possible with a pit spacing of 400 cm, because there is about 4 cm of room to install the toilet.
If you want to block someone else's sewer, there is no problem, but if it is an opening to plug it, there will be water seepage.
Buy a concentrated product and pour it into two capfuls, and you can easily solve the problem of soap blockage.