I had a stubborn clog like this. Draino did nothing. Drain took an entire 25ft snake and found nothing. I went and bought a drain bladder. You hook it up to a water supply and it expands to seal itself in be pipe and then uses pressure to blast the clog out. I figured I had a 50/50 shot at either clearing the clog or exploding a pipe in my wall.
I have no idea where the clog was or where it ended up, but I haven’t had a problem in the 2 years since
I don’t think those bladders are sold in my area, but it sounds like something that would have worked in my situation. So to be clear, once it fills with water, does not also discharge water on the opposite side that it is fed water? Is the pressure then limited to the household water supply pressure?
Exactly right. There’s a small hole in the free end that creates enough restriction for the bladder to inflate but lets the water come out once it’s sealed in the pipe