...water it went back to my sink. Wh? My kitchen sink water goes OK unless I have used my washing machine and the water it went back to my sink. When I turn my tab for more 10 second and water will go slowly. I think it can be the pipe that runs from the sink to the outside drain was partially blocked. I have tried soda costal and other products from the supermarket and they don’t work. Any suggestions? Thank you very much.