Bathroom sink fills up from backflow, after repairs.
A few weeks ago we notice a drip under the bathroom sink. It is an older house with mostly original plumbing. The plumber changed out the P drain but we saw while the pipes were out that the pipes further along were just rusted and falling apart. He changed parts into the wall until it looked OK, he said. He said it still may leak 'in the wall'. When he finished the sink backed up, so he used some white strong powder and the snake type tool. We had less pressure than before he repaired it, but no leaks under the sink.
We evacuated for a week due to Gustav, and after 2 days home this morning the sink is totally stopped up. This afternoon it overflowed onto the floor, with no one using it and no other water or appliance going in the house. We often wonder if we have some sort of connection with the other side of the house; it's a duplex owned individually.
How can the water come back up into the sink? (clear water)
So in looking under the sink we now see a leak from where the lever thing between the faucets connects to the main drain pipe under there.
There might have been a drip from the cold water valve, and maybe from the new brass connection going into the wall; not sure. It was all wet. It's mainly where that lever connects though. Could it possibly be something simple in where this connects?
The plumber shockingly, to us, charged $50hr and was here two days. Do you find that pricey? Does one pay each time though the problem may be related to the first repair? Not sure how that works. Thanks for any guidance!