Thanks for the help in my other posts. Hope we are not being a pain. Spent all day trying to fix a drain problem. Here is the issue. When we turn on bathroom faucet the water eventually backs up in shower. Some yucky and smelly water comes up in the shower? We have tried baking soda, using a snake on all drains and even running and spraying with a hose. The kitchen sink drains fine. The toliet drains fine. Just a strange issue with shower draining and bathroom sink. The pipes seem clear. It is driving us crazy. When the shower fills up with water it seems to help when we release grey water tank for it to drain if that means anything? Any ideas??