In fact, the root cause of the back-odor problem of the floor drain is not the floor drain. Where does the stench coming from? sewage pipe.

According to the standard, the sewage pipe (the pipe used by the toilet) and the drainage pipe should be separated, but the actual situation is that a large part of the sewage pipes and drainage pipes of residential buildings finally merge into the main pipe, so that the odor of the sewage pipe It can be emitted from the floor drain through the drain pipe. Most of the housing with aftertaste occurs in this case. Normally, there should be three main pipes on the façade of a building, which are drainage pipes, sewage pipes, and exhaust pipes, but many houses only have two. Therefore, the pipes at the water outlet generally have their own traps, which use the accumulated water to isolate the odor.

Many owners of water traps are afraid of clogging, so they have canceled the use of water traps during decoration. In this case, the floor drain is easy to return to odor. Even with a trap, it's not foolproof. Because once the water in the trap is insufficient, the odor will come out through the aquifer. When will the amount of water be insufficient? When you flush the toilet or use the sink, the air pressure in the drain pipe changes, which sucks a little water out of the trap. If people keep flushing the toilet, but no one takes a shower, the trap under the floor drain will not be replenished with water. When the water is insufficient, the smell will return.