Choosing between in-kitchen and underground grease traps - what would you do?

when something did go wrong, it was a nightmare to fix. Plus, those pump-outs aren’t cheap.

Man, you’re not kidding about the pump-outs. I’ve seen folks nearly faint when they get that bill. Had a job last year where we had to jackhammer through a patio just to get at a clogged underground trap - felt like we were digging for buried treasure, except all we found was old grease and regret. Under-sink units might be messier day-to-day, but at least you don’t need a backhoe when things go sideways. Automatic ones? More bells and whistles, more headaches down the line... Murphy’s Law loves moving parts.

I get where you’re coming from, but honestly, I’d still take the underground trap over the under-sink ones for bigger kitchens. Yeah, "

jackhammer through a patio just to get at a clogged underground trap

I totally get not wanting to deal with those little under-sink traps all the time. I’ve had a couple properties with them, and it felt like every other week someone was calling about a clog or nasty smell. The underground ones are a pain when something goes wrong, but honestly, I’ve only had to dig one up once in almost ten years. For bigger kitchens, I’d probably make the same call you would - less frequent hassle, even if it’s a bigger job when it happens. Sometimes you just pick your poison, right?

Honestly, I lean the other way. The underground traps might seem lower maintenance, but when they do need work, it’s a major hassle and expense - especially if you have to break concrete or dig up landscaping. With under-sink models, yeah, you’re cleaning them more often, but at least it’s a quick job and you can spot issues before they get out of hand.

Sometimes you just pick your poison, right?

True, but for me, smaller regular tasks beat surprise big-ticket repairs every time. I’d rather budget my time and money in predictable chunks than risk a huge bill down the line.

I get where you’re coming from - nobody likes the idea of jackhammering their floor just to clear a clog. But here’s the thing: in my experience, a properly sized and installed underground trap, with regular scheduled pumping, can go years without major issues. The key is making sure it’s not undersized or neglected, which is where a lot of folks run into trouble. I’ve seen some setups where the under-sink units get overwhelmed during a busy service, and then you’re dealing with backups in the middle of a rush. Not fun.

That said, I do think there’s something to be said for the peace of mind you get from being able to just pop open the under-sink trap and see what’s going on. It’s more hands-on, but you’re right - you catch problems before they snowball. Still, I wonder if the frequency of cleaning ever gets old for folks running larger kitchens. At what point does the labor involved start to outweigh the risk of a rare but expensive underground repair? I’ve seen places where staff get lax about maintenance, and then even the under-sink units cause headaches.

Curious if anyone’s found a sweet spot - like maybe using both types in tandem for different parts of the kitchen, or staggering maintenance schedules to avoid surprises. Or is it really just about picking your battles and hoping you picked right?

I’ve watched a few places try to cut corners with those tiny under-sink traps, thinking they’d just empty them out every night, and honestly, it never lasts. Someone forgets, or the new guy doesn’t know the drill, and suddenly there’s water all over the floor during dinner rush. But then again, I’ve also seen the underground ones get ignored for way too long because “out of sight, out of mind,” and when they finally back up... it’s a nightmare. Usually involves a lot of finger pointing and some very expensive downtime.

I guess I lean toward a combo if you can swing it. Like, use the under-sink ones for the heavy hitters - dish pit or prep sinks - and let the big underground trap catch whatever sneaks through. Still need a solid schedule, though. People always say they’ll stay on top of maintenance but in reality? Life gets busy, folks get lazy, and you’re right back to square one. Never seen a perfect system yet - just different flavors of headaches depending on how much you want to gamble with your plumbing.

People always say they’ll stay on top of maintenance but in reality? Life gets busy, folks get lazy, and you’re right back to square one.

Ain’t that the truth. I’ve lost count of how many times I’ve walked into a place where the manager swore up and down they had a “system,” only to find the under-sink trap packed solid with old grease and potato peels. Doesn’t matter how fancy the setup is if nobody’s actually keeping an eye on it.

I will say, though, I’ve seen some kitchens do alright with just the big underground trap - if they’ve got a reliable service coming in on a strict schedule. But that’s usually bigger operations with deep pockets. Smaller spots? They try to save a buck and end up paying double when it all backs up.

Curious if anyone’s tried those newer automatic grease removal units? I’ve only seen one in action, and it seemed like more moving parts to break, but maybe I’m just old school. Anyone had luck with those, or is it just another headache in disguise?

Never quite trusted those automatic units, to be honest. More gadgets usually mean more things that can go sideways, especially in a busy kitchen where folks aren’t always gentle. What’s the backup plan if the skimmer fails or gets clogged? I’ve seen one place get hit with a nasty overflow because the auto-removal didn’t catch everything. At least with the old-school under-sink traps, you know when they’re full... unless everyone ignores them, which, yeah, happens way too often. Maybe it really comes down to who’s actually checking - machines or people - because neither is foolproof.

I get the worry about more moving parts - less to break with a basic trap under the sink. But I’ve seen those old-school ones ignored for weeks, and the smell is unreal when someone finally checks. At least the automatic units are supposed to alert you, right? Wonder if anyone’s actually had one of those alarms save them from a mess, or do they just get ignored like everything else?

I’ve actually had one of those automatic grease trap alarms go off in the middle of dinner once - scared the heck out of my dog, but at least it did its job. Honestly, I’m with you on the “more moving parts, more things to break” logic, but I also know myself... I’m not always the best at remembering to check stuff under the sink. Out of sight, out of mind, right? The old-school traps are simple, but if you forget about them, you’re basically just waiting for a science experiment to start growing down there.

The alarm was annoying, but it definitely saved me from a way bigger mess. I guess it comes down to whether you trust yourself to stay on top of maintenance or if you’d rather have a gadget nag you. Either way, both options have their headaches. I just wish there was a version that cleaned itself and made coffee while it was at it...

I just wish there was a version that cleaned itself and made coffee while it was at it...

If someone invents that, I’ll be first in line. Until then, I’m with you - those alarms are a mixed blessing. They’re like smoke detectors for grease, except instead of saving your life, they just save your kitchen from turning into a biohazard.

I get the “out of sight, out of mind” thing. I’ve seen way too many under-sink traps that look like they’re auditioning for a horror movie. The thing is, the more high-tech you go, the more you’re relying on sensors and electronics that can fail in their own special ways. But if you’re not the type to remember regular checks (and honestly, who is?), the alarm’s probably worth the occasional jump scare.

Underground traps are less hassle day-to-day but way more of a pain when they need cleaning or something goes wrong. At least with the in-kitchen ones, you know right away if there’s an issue... even if it means your dog gets a surprise during dinner. It’s really about picking your poison - constant reminders or big surprises down the line.

I’ve dealt with both setups over the years, and honestly, neither is perfect. In-kitchen traps are a pain for tenants but at least you know when there’s a problem. Underground ones? Out of sight until you get a nasty backup or expensive plumbing bill. I’d rather deal with the occasional alarm than surprise repairs that mess up everyone’s week.

Curious - has anyone actually had an underground trap go bad in the middle of a lease? That’s the kind of headache I try to avoid...

Had an underground trap fail on me about three years back - total nightmare. The backup happened during a holiday weekend, of course, and by the time we figured out what was going on, the kitchen was basically unusable. Ended up having to dig up half the patio to get at the thing. Since then, I’ve stuck with in-kitchen traps even though they’re not exactly pretty or convenient. At least you can see when something’s off before it turns into a disaster.

Honestly, I’ve seen way too many underground traps turn into expensive headaches. Out of sight, out of mind... until you’re knee-deep in a mess and jackhammering concrete. In-kitchen traps aren’t pretty, but at least you can spot trouble before it gets ugly. I’ll take a little ugly under the sink over a surprise patio excavation any day.

I’ll take a little ugly under the sink over a surprise patio excavation any day.

Man, I hear you on that. Had a buddy who went the underground route thinking it’d be “out of sight, out of mind” too. Fast forward a couple years and he’s got a mystery stink wafting up through his backyard. Turns out, the trap was clogged solid and he had to rip up half his stamped concrete patio just to get at it. Not cheap, and definitely not fun.

I get why folks want to keep things tidy in the kitchen, but honestly, I’d rather deal with a bit of an eyesore under the sink than risk a full-blown outdoor disaster. At least if something starts to go sideways, you can catch it early - usually before it turns into a wallet-draining project.

That said, I’ve seen some pretty gnarly in-kitchen setups too... like, “how is this even legal?” kind of stuff. But at least you can see what’s going on and fix it before it gets out of hand. Guess it’s all about picking your battles.

Yeah, I’m with you - if something’s gonna break, I’d rather it be where I can actually see and reach it. Here’s how I look at it: under the sink, you might deal with some gunk and the occasional smell, but you can usually fix it with a wrench and some gloves. Underground? That’s a whole different ballgame. Digging up a patio is nightmare fuel for my wallet.

One thing I’d add: if you’re stuck with an in-kitchen trap, check it every couple months. Doesn’t have to be fancy - just make sure nothing’s backing up and the seals aren’t shot. A little maintenance beats a big repair bill every time.

I hear you on the nightmare of digging up a patio - seen too many folks regret going underground just for that reason. But I gotta say, in-kitchen traps can be a pain if you’ve got a busy kitchen. They fill up fast and if you miss a cleaning, things get gross quick. Ever had one overflow during a dinner rush? Not fun. Curious, do you think the smell from an in-kitchen trap is worth the trade-off for easier access, or does it drive you nuts after a while?

Curious, do you think the smell from an in-kitchen trap is worth the trade-off for easier access, or does it drive you nuts after a while?

Honestly, the smell is what killed it for me. I tried an in-kitchen trap in my last reno and even with regular cleaning, there was always this faint funk lingering. Maybe I’m just sensitive to it, but it drove me up the wall. That said, digging up a patio is a whole other headache... but if you’ve got the space and budget, I’d still go underground. Less day-to-day hassle, even if it’s a pain upfront.

Had the same debate in one of my rentals a couple years back. Here’s what I learned:

- In-kitchen traps are a nightmare for tenants who don’t stay on top of cleaning. Even with reminders, you get that weird smell creeping in after a few months.
- Underground is a pain to install, yeah, but once it’s in, you barely think about it. Less tenant complaints, less maintenance calls.
- Only exception: if you’re super tight on space or budget, then maybe the in-kitchen is worth the hassle... but honestly, I’d rather deal with the upfront mess than ongoing stink.

Just my two cents - smell always ends up being a bigger issue than people expect.

Had an in-kitchen trap in my last place and yeah, the smell crept up way faster than I expected. Even with baking soda tricks, it lingered. Switched to underground at my current house - install was a headache, but honestly, haven’t thought about it since. Less drama all around.