Real talk about drainage: why testing multiple faucets will save you time, money, and headaches

https://www.alphabookmarks.win/shared-drain-nightmares-what-koala-plumbing-s-research-reveals-about-connected-fixture-backups

3 key factors to consider when you’re trying to figure out a drainage problem When a sink or shower is slow, people jump straight to plungers and snakes. That’s fine sometimes, but what really matters is figuring out where the problem lives