Generally, the toilet in a blank room is 70~80mm lower than that in the living room. When the traditional floor drain is buried in the ground, it is generally necessary to plan the groove, which will destroy the waterproof layer and lead to excessive water leakage in the buried pipe. The real ultra-thin floor drain will be buried less than this height. Therefore, the concept of ultra-thin is not floor drain, water diversion, nor reducing the height of water seal, but defined from the depth of buried pipe.
As far as I know, there is only the shallowest buried pipe on the market: Sanming ultra-thin odorless floor drain. The buried depth of the pipe is only 66mm, which can be called ultra-thin in the world and three national patented technologies. This is what we call ultra-thin floor drain.
As for how deep the buried pipe is, it is an ultra-thin floor drain. There is no uniform standard in China at present.
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