That “blub-blub” is classic air displacement—seen it a hundred times.
I mostly agree, but I’ve seen setups where that gurgle was the first hint of a venting issue or partial blockage. Not saying you need to rip out walls for a dedicated line, but I’d keep an eye on it if it gets louder or starts happening more often. Sometimes those little noises are the plumbing’s way of warning you before things get messy.“unless you’re getting water coming up or slow drainage, it’s probably just air moving through the pipes—a little annoying but not a sign of disaster.”
Had a tenant call me about that same “blub-blub” once—turned out it was a slow build-up in the trap. Like you said,
I’d rather deal with a minor annoyance than a flooded cabinet. If it gets worse, I’d check for partial clogs or venting issues before they turn into bigger headaches.“Sometimes those little noises are the plumbing’s way of warning you before things get messy.”
I’ve run into that “blub-blub” plenty of times, and you’re right—it’s usually a heads-up before things get ugly under the sink. As for dishwasher hookups, I lean toward a dedicated drain line if you can swing it. It just seems to cut down on weird noises and slow draining over time. Under-sink setups work, but they’re more prone to those partial clogs and venting quirks, especially in older houses. If you’re already doing some plumbing work, adding a dedicated line isn’t that much more hassle and could save you headaches later.
I get where you’re coming from, but honestly, a dedicated drain line isn’t always worth the extra work or cost. Most under-sink setups do just fine if you keep the trap clear and don’t ignore those early warning noises. I’ve seen plenty of “upgrades” that just added more joints to leak down the road. Sometimes simpler is better, especially if you’re not tearing everything apart anyway.
I get the appeal of keeping things simple, but I’m not totally sold on the under-sink hookup being “good enough” long-term. When we moved in, our dishwasher was hooked up that way and it worked… until it didn’t. One clog in the kitchen sink and suddenly the dishwasher was backing up too. Not fun to clean up after a cycle when you’re expecting clean dishes, not a mess.
Yeah, a dedicated drain line is more work upfront, but I’d argue it’s less hassle down the road—especially if you’re already doing some plumbing work anyway. Fewer shared lines means fewer surprises when something goes wrong. Maybe it’s overkill for some setups, but after dealing with one nasty backup, I’d rather have the peace of mind. Just my two cents—sometimes “simpler” ends up being more complicated when stuff starts failing.
