When I use the kitchen sink the waste water comes up in the shower in the master bathroom. The bathroom and the sink are on the same floor, there is 1 other shower on the same floor and it does not back up. I have tried tons of draino on both the sink and the bathroom and nothing is working. Is there anything else I can try before having to call a plumber?

Thanks

When I use the kitchen sink the waste water comes up in the shower in the master bathroom. The bathroom and the sink are on the same floor, there is 1 other shower on the same floor and it does not back up. I have tried tons of draino on both the sink and the bathroom and nothing is working. Is there anything eles I can try before having to call a plumber??

Thanks

First off, As a repair plumber I have never recommended using harsh chemicals. In your drainage system. Besides they only seem to work in TV commercials and when you try to remove the water you could burn your hands or damage your eyes. Having said that they only way to be certain to fix your problem would be to rent a sewer machine, (see image) and snake the line from the kitchen roof vent. Put out enough snake to reach the base and 20 feet more. Good luck, Tom