The same branch is shared by a bathroom (toilet, shower, sink) and those bathroom drains have never had a clog. Although they always periodically stunk despite full traps so I suspect a leak was always there. But since it’s only occasional I wonder if it’s a leak at the top of a pipe, not spillage. Well, otoh there might be spillage going on in the bathroom because there are drain flies, which might be feeding on spillage from somewhere. It just seems bizarre that the odor only manifests occasionally.
The big branches meet at a main Y connector. That Y connector is new. The basement had a serious leak under the concrete a couple years ago. The basement floor was dug up and new pipe was installed. I doubt there would be any issues with this new pipework. I think the only segment that’s quite dicey is from the kitchen sink to wherever it joins the bathroom.
(edit) are you perhaps thinking that the clog has moved along and will clog again downstream? I doubt that, because the diameter of the kitchen drain is 40mm and it eventually joins a branch that’s like 90mm in diameter. If this thing were to snowball for some reason, it could probably be reached from the cleanout at the main Y fitting, no?
Whatever the issue is, I think you should clean it from outside and towards inside, instead of going outwards from inside.
This usually requires a sewer truck. Or you can put a hose up the Y clean out. That can also be done with a power washer snake attachment, but at that point it’s easier to call the sewer truck, because these consumer gadgets aren’t really that great. I’ve tried everything and in the end I had to call the truck anyway. You’re already hundreds of dollars into gadgets and chemicals. Stop it. Cut your losses and call a professional next time.
I can’t quite work out if you’re making a prediction of a clog returning, or if you’ve not realized that there is no longer a clog.
For weeks I have been fighting clog. But the clog is finally gone and the drain is now faster than I have ever seen. The drain actually keeps pace with the faucet on full blast. In the past, even in the best of times, I think the fastest it drained was 1 liter in 20 seconds. Now 1 liter drains in 6 seconds.
You’re already hundreds of dollars into gadgets and chemicals. Stop it. Cut your losses and call a professional next time.
Pros give different results in different areas. I called a plumber for a leak once. I was out of town, but a simple leak was dripping and forming a puddle on the floor. The leak was in exposed PEX pipe visibly strapped to the wall (yes that room is quite ugly). The plumber spent little time, failed to find the leak, blamed something that was fine, and charged €200. We called him back and he made the outrageous claim that the puddle was due to “condensation”. Left and gave no refund. I would love to have a reliable & trustworthy plumber. But since I don’t have that I have to become the plumber.
My costs in the drain fight were ~¾ of €200 (less than the incompetent plumber’s charge for simply showing up). Every time I redo the pipes I’m appalled by the work of past plumbers. So I think I’m just not in a good place to hire plumbers. There is no quality control of any kind in my area. No Better Business Bureau of sorts to record complaints. So the infrastructure is not setup for bad plumbers to fail.