I have a double kitchen sink. When I open the water on the disposal side the other side of the sink clog and later both sink clogs up. I open the trap underneath the sink and its. I use 25 ft. long snake couple of times and the result is negative. My laundry room sink start to clog also when the kitchen sink clogs. I also use the snake at the laundry sink but no avail. What's seems is the problem please help