TIRED OF BEING EMBARRASSED OF YOUR LITTER BOX MAKING YOUR HOME SMELL BAD?
Written after three years of trying everything else
I paid a person to come to my house and scoop while I was away. It still smelled.
I tried two litter boxes. Then an automatic one. I scooped constantly — morning and night, every day, for years. And when I traveled, I hired someone to come in and do it for me.
None of it worked. Not partly. Not for a while. The smell simply won.
So I moved on to air purifiers. HEPA helped with dust and fur — but this was never a dust problem. It was an odor problem, and odor is a gas. HEPA is a net built for particles; gas molecules go straight through it. Different physics, different tool.
Activated carbon was the one thing that actually worked, because it traps odor molecules instead of covering them up. So I built Miso to plug straight into the wall next to the box. No counter space, no cords across the floor.
I named it after my cat, Simona. Her nickname is Miso. Now you know why.
Most litter boxes are in small spaces. Odor gets trapped in small spaces.
There is nowhere to move your litter box to.
Bathroom
Laundry room
Closet
Entryway
STOP BREATHING IN THE AMMONIA CREATED BY YOUR LITTER BOX
Here’s the part that surprises people: there is none in fresh cat urine. What’s there is urea, which is odorless. Bacteria produce an enzyme called urease that converts it into ammonia gas — steadily, over hours, in the air above the litter. Which means it is still being made long after you have scooped.
You have been cleaning at the two moments of the day when there is the least to clean — and leaving the other fifteen hours completely unattended.
“You just can’t outscoop the smell.”
And it isn’t one smell. It’s three.
Released at three different moments — which is exactly why one fragrance never quite works.
Ammonia
Bacteria break urea down into ammonia gas within hours. The sharp note that hits you at the door.
Hydrogen sulfide
Heavier than air, so it lingers low and concentrates inside covered boxes.
Feline odor
Detectable at parts per billion. The one that clings to fabric and follows you out of the house.
How many of these are true right now?
Are you tired of masking the smell with air fresheners?
Are you tired of trying yet another expensive litter that doesn’t quite work?
Are you tired of apologizing for the smell when people come over?
Are you tired of being embarrassed of the smell?
A filter that meets the gas where it’s made
Miso plugs into the outlet nearest the box. No counter space, no cords across the floor, nothing your cat can knock over.
Air is pulled through a network of microscopic pores, where odor-causing molecules — ammonia, 3M3MB and other volatile compounds — stick to the carbon’s internal surface.
You swap the filter — and that’s the proof
Odor is produced continuously, so capture has to be continuous. A fresh cartridge restores full capacity roughly every 30 days. That isn’t a hidden cost. It’s the only honest evidence anything was ever being held — a device with nothing to saturate had nothing to capture in the first place.
Over 5,000 customers — MISO is loved
In their words. Not ours.
“I stopped worrying about people smelling the litter box.”
Before MISO, I felt like I could smell the litter box every time I walked into the room. Now the area just smells noticeably fresher.
“Perfect for my apartment.”
I don’t have a separate room to hide the litter box, so odor used to travel everywhere. MISO has made such a difference in my small space.
“It helps between scoops.”
I still scoop every day, but the biggest difference is the hours in between. The smell doesn’t seem to linger in the room like it used to.
“I didn’t realize how nose-blind I had become.”
I thought my house smelled fine until I came home after being away for a few days. That’s when I bought MISO. Huge improvement.
“My guests don’t immediately know I have a cat anymore.”
My litter box is pretty close to my living room, which always embarrassed me. MISO gives me so much more confidence when people come over.
“So much easier than constantly spraying something.”
I was using sprays, candles, and plug-ins all the time. MISO is way easier — I plugged it in near the litter box and basically forgot about it.
“Great for a multi-cat household.”
With two cats, odor builds up FAST. MISO doesn’t replace cleaning, but it definitely helps keep the room from getting that heavy litter-box smell.
“Finally something made specifically for the litter box area.”
I’ve tried normal air purifiers before, but they felt like overkill. I like that MISO is small and designed specifically for this problem.
“The room smells like a room again.”
That’s probably the best way I can describe it. It doesn’t smell perfumed — it just doesn’t smell like there’s a litter box sitting there anymore.
Pictures from real Miso customers.
Questions, answered
Does Miso actually remove the smell, or just hide it?
Neither, quite. It captures — and the distinction matters.
Fragrance hides: it adds a second smell over the first. Miso adds nothing. Activated carbon holds odor molecules inside its pores rather than letting them drift through the room.
But we won’t say “eliminates,” and be careful with anyone who does. Elimination means complete removal, and no device can honestly claim that for a gas being produced continuously a few feet away. What we promise is continuous capture at the source — and thirty days to judge it.
How is this different from my HEPA air purifier?
HEPA is built for particles — dust, dander, fur. Litter box odor isn’t a particle, it’s a gas, and gas molecules pass straight through a HEPA filter the way air passes through a net.
That isn’t a knock on HEPA. It is genuinely excellent at the job it was built for. It just wasn’t built for this one.
Miso uses activated carbon, which works by adsorption: odor molecules stick to the carbon’s enormous internal surface and stay there. Different physics, different tool. If you already own a HEPA purifier, keep running it — the two are solving different problems in the same room.
How often do filters need changing, and what do they cost?
Roughly every 30 days. A replacement cartridge is $49.99.
Carbon works by filling up — that is the entire mechanism. A cartridge that saturates is evidence it was holding something; a device with nothing to saturate had nothing to capture in the first place. Swapping it restores full capacity.
Treat it as a running cost the same way you treat litter. If a product in this category tells you it never needs a refill, ask what it is actually capturing.
Is it safe around cats?
Miso adds nothing to the air. No ozone, no ions, no fragrance, no mist. Air is drawn in, passes through carbon, and comes back out — that is the whole cycle.
It mounts at the outlet rather than sitting on the floor, so there is no cord stretched across the room and nothing at eye level for a curious cat to knock over.
It is also quiet. That matters more than it sounds: cats are particular about their box, and a device that startles them can change their habits. Shy cats keep using the box, because from their point of view nothing changed.
Will it work for my multi-cat household?
It helps — and it is worth being straight with you about the limits.
Two cats produce roughly twice the odor, and one unit holds one cartridge’s worth of capacity. If you run more than one box, or your boxes sit in different rooms, use one Miso per box. That is why we sell them in a set of three rather than pretending one covers a house.
And Miso doesn’t replace scooping in any household, single-cat or not. It works the hours in between, which is where the smell actually accumulates.
What if it doesn’t work for my house?
Then you pay nothing. Run it for 30 days. If you don’t notice an improvement, email us and we refund every cent and cover the return shipping. No questions, no restocking fee, no hoops.
One suggestion on how to judge it, since this is the whole premise of the page: you can’t audit your own house with your own nose. Have someone over near the end of the trial and watch what they do when they walk in. That is the real test.
Three products. One job.
Everything Miso makes exists to handle the same square foot of your home. Start in the middle.
No improvement in 30 days? You get every cent back.
Try Miso for 30 days. Plug it in and leave it running. If you don’t notice an improvement in that time, you get a full refund — that is the whole guarantee, in one sentence.
And here is the easiest way to judge it, since you can’t trust your own nose: have someone over. If they can still smell the litter box —
Simply drop us an email and we’ll refund every cent.
No questions asked, no hoops to jump through, and no hard feelings. We cover the return shipping too.
Bottom line:
Either your home stops giving you away… or you pay nothing.
It’s more like a refundable deposit on finding out.
We’re not going to tell you it eliminates odor. Nobody can honestly tell you that. What we’ll tell you is what it captures, why the mechanism follows from the chemistry, and that you have thirty days to find out.