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There is no standard for this, as long as it is not broken, it can be used forever. Of course, you can check it regularly. If it is found to be damaged or is likely to be damaged (such as aging, slight water leakage, etc.), it can be replaced.
Analysis: (1) The toothbrush should be changed every 3 months. >>>More
All kinds of filter cartridges are marked with the time of use >>>More
If you are upstairs, wrap the sewage pipe with sponge sound reduction material before the ceiling. Without such treatment, the drainage sound is very loud.
It stands to reason that the smoke exhaust pipe should be installed vertically and discharged to the roof of the building to allow the smoke to diffuse, and the exhaust on the first floor may be blown into the room by the headwind.
This kind of problem!! 1 month, because there are bacteria on it.