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This should be found in the property belongs to the quality of the house. The responsibility should lie with the developer.
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Everything has a certain service life, if it is a quality problem, you can find a property company to deal with.
The diagonal tee is smoother, but it will be more reasonable to use the shunshui tee construction, and a 50 branch pipe can be divided into 2 pipes at most.
The upstairs sewer pipe, upstairs repair, it doesn't cost much, because it's downwater, there is no pressure, and it's okay to wrap it tightly with waterproof self-adhesive tape.
If you want to calculate the length of the tube, then it should be measured in meters of extension, starting from the center line of the tube.
If there is a leak in the water supply pipe, it is best to replace the tee. It is difficult to solve the problem fundamentally by plugging the leak through some glue substances.
It can be tightly wrapped with waterproof tape (self-adhesive tape), because there is no pressure, it is perfectly fine.