Floor drain backwater is generally caused by clogged pipes, you can use the pump unclogging method, first put the pump hose into the drain inside, and then seal the drain, and then pour enough water, and then pour the water at the same time and quickly to the drain inside the pump, so that you can unclog the water pipe. Or you can use baking soda to unclog, first baking soda and vinegar mix evenly poured into the floor drain, to be its chemical reaction with the blockage can be unclogged.
1, may be the floor drain is clogged by garbage, debris, etc., resulting in the emergence of backwater phenomenon.
2, may be the drain pipe is clogged with debris, backwater occurs.
3, may also be the drain pipe is not installed properly.
4、It is also possible that the air pressure in the pipe is too large, causing the phenomenon of backwater.