The shower room upstairs uses water, and there is a clattering sound downstairs, but there is no lea

This is caused by the water flow hitting the sewer pipe wall, the general sewer pipe through the floor slab installation method, the riser is 40 50 cm long, when the upstairs drainage is just in the center of the riser, the water flow directly hits the pipe wall below, it will make a sound, especially the tee part without the water trap, plus the riser at the position of the basin will be louder. Try changing the direction of the water so that it has to flow down the walls of the pipe, and it will reduce the noise. The specific method needs to be decided according to the on-site situation, the sound of water droplets has a certain relationship with the drainage of the shower room, and there may be a section of horizontal pipe to change the position, and there is some lag in poor drainage, forming a slow flow and dripping discharge, which prolongs the drainage time.

If it is an active pool, you can see if you can insert the pool drainage hose deep into the drainage riser, which can generally buffer the flow of water. If the upstairs is an embedded part, it may be easier to handle it from the downstairs, and the riser can be modified to a slight slope, or a water bend can be added, or two 135-degree bends may be used to form a buffer joint.