GUIDE / KENNELS

Kennel Drain and Trough Odor: How Two Utah Animal Hospitals Keep Their Kennels Fresh

A kennel trough drain smells because the waste that goes down it, urine, feces, hair and wash water, settles in the trough channel and the drain trap where the bacteria digesting it run out of oxygen. Starved of oxygen, those bacteria produce the gases behind the kennel smell, and no amount of scrubbing the floor reaches them. Two Utah animal hospitals clear it a different way: as the last step of their deep clean, with the animals out of the runs, they spray DRP Accelerator on the kennel trough and down the drains from an ordinary pump sprayer. The compound carries usable oxygen to the bacteria already living in the drain, so they digest the waste instead of leaving it to rot. Both hospitals report the kennel smell gone and the trough drain staying clean between deep cleans.

The smell is not on the floor you scrub. It is in the trough and the drain, where waste sits without oxygen.

A kennel trough drain smells because urine, feces, hair and wash water settle in the trough channel and the drain trap, where the bacteria digesting them run out of oxygen.
Bacteria that run out of dissolved oxygen take it from sulfate instead, and the sulfide left behind becomes hydrogen sulfide gas.
Scrubbing and rinsing a kennel floor removes the waste on the surface but leaves the biofilm inside the trough channel and the drain trap in place.
Bleach and deodorizers act on the surface or on the air, and the smell returns once the waste below the drain grate is fed again.
DRP Accelerator is an inorganic compound that carries usable oxygen to the bacteria already living in a drain, with no bacteria, enzymes or chemical additives added.
Mtn Green Animal Hospital in Mountain Green, Utah and Agave Animal Hospital in St. George, Utah apply DRP Accelerator to their kennel troughs and drains as part of deep cleaning, with the animals out of the runs.

Published September 28, 2026

What makes a kennel trough drain smell

Every kennel run drains to the same place: a trough along the back or the middle of the runs, and a drain at the low end with a trap under the grate. Everything that comes off the floor goes there, urine, feces, hair, food and the wash water that carries them, and some of it stays. It settles in the trough channel, coats the drain walls and sits in the trap as a layer of organic waste. Bacteria move in and start digesting it, which is what bacteria do, but inside a wet trough and a trap that layer runs out of dissolved oxygen within hours. Starved of oxygen, the bacteria take it from sulfate instead, and the sulfide left behind becomes hydrogen sulfide gas. That is the rotten-egg edge to a kennel smell, and it comes from below the grate, not from the floor a crew has just scrubbed. The mechanism is the same one that makes a lift station or a force main smell, only smaller, and our guide on why bacteria need oxygen walks through it in full.

Why scrubbing, bleach and deodorizers keep losing

A deep clean removes what is on the surface. Scrub brushes, hot water and a hose clear the floor and the visible trough, and for an hour the kennel smells clean. What none of that reaches is the biofilm inside the trough channel and the drain trap, which is where the odor is made. Bleach kills whatever it touches and is gone with the rinse, so the surviving film below the grate is back to work by the time the next run is hosed down. Deodorizers and fragrances treat the air, the same way the scrubbers and masking agents we compare ourselves to treat the air above a wet well: they cover the smell and change nothing about the waste that makes it. Enzyme drain products break some of the waste apart but do not change the oxygen the bacteria are missing, so the trough goes back to rotting once the enzyme is spent. The kennel smells again because the cause was never touched.

What two Utah animal hospitals do instead

Mtn Green Animal Hospital in Mountain Green, Utah and Agave Animal Hospital in St. George, Utah run busy hospital kennels, the runs where patients recover and day-drop pets wait, and both had the trough drain smell every kennel has. Both now clear it the same way, as the last step of their deep clean.

With every animal out of the kennel area, the runs are scrubbed and rinsed as usual. Then the staff mix DRP Accelerator in an ordinary garden pump sprayer, the kind sold for weeds, and spray it along the trough and down each drain, where the waste actually sits. It is never sprayed while animals are present, and the runs go back into service on the hospital’s normal deep-clean schedule. That is the whole procedure. No equipment was installed and no chemical program was added.

What both hospitals report is that the kennel smell is gone after the deep clean, not covered, and that the trough drain stays clean between cleans instead of building the layer that used to be scraped out. The sharp smell of urine is a different reaction, and we do not claim to neutralize ammonia. The rot and the rotten-egg smell that come from waste sitting in the drain are what the compound goes after, and that is most of what a kennel smells of.

Why it works below the grate

DRP Accelerator is an inorganic compound that carries usable oxygen to the bacteria already living in the trough and the drain trap. We add no bacteria and no enzymes; the drain already has more bacteria than it needs. With oxygen available, those bacteria stop taking it from sulfate, so the sulfide that becomes hydrogen sulfide is not made, and the aerobic bacteria, the fast ones, keep digesting the organic layer after the crew has gone home. The compound is consumed as the bacteria use its oxygen, so nothing of it stays in the drain and there is no residue to rinse out later. It is not an oxidizer and it does not attack the trough, the grate or the trap. What we know about its handling, and how we test it, is on our testing and safety page, and anyone applying it in a kennel should read that page and follow the hospital’s own cleaning protocol.

How to do it in your own kennels

Empty the kennel area. Every animal out of the runs before anything is sprayed. This is part of deep cleaning, never part of a daily hose-down with animals in the runs.
Scrub and rinse as usual. The compound is not a cleaner. Clear the surface waste first so the oxygen goes to the film in the trough and the trap, not to a fresh pile on the floor.
Spray the trough and the drains, not the floor. Mix DRP Accelerator in a pump sprayer and put it where the waste sits: along the trough channel and down every drain, enough to reach the trap.
Leave it to work. The bacteria do the rest over the following days. Repeat with each deep clean; the hospitals found the drain stays clean between cleans rather than needing to be scraped.
Watch the trap. If a drain still smells after a few cycles, the trap is dry or the line is blocked, which is a plumbing problem and not a biology one.

Where else the same approach works

Anywhere organic waste sits in a trough, a trap or a line without oxygen: boarding kennels, animal shelters, grooming salons, dairy milking parlors and their wash-down drains, feed alleys, and the lift stations and force mains we treat for towns. The scale changes, from a pump sprayer in a kennel to a metered drip at a wet well, and the biology does not. If you run a facility with a drain that smells no matter how hard it is cleaned, contact us and we will tell you whether a hand application like the hospitals use or a metered program fits.

Summary

A kennel trough drain smells because waste settles in the trough channel and the drain trap, where the bacteria digesting it run out of oxygen and make hydrogen sulfide.
Scrubbing, bleach and deodorizers work on the surface or the air and leave the film below the grate to start again.
Mtn Green Animal Hospital and Agave Animal Hospital spray DRP Accelerator on the trough and down the drains as the last step of a deep clean, with the animals out, and report the smell gone and the drain staying clean between cleans.

COMMON QUESTIONS

Straight answers.

Why does a kennel drain smell even after it has been scrubbed?+

Because the smell comes from below the grate. Urine, feces, hair and wash water settle in the trough channel and the drain trap, and the bacteria digesting that waste run out of oxygen. Starved bacteria take oxygen from sulfate instead and leave sulfide behind, which becomes hydrogen sulfide gas. Scrubbing clears the floor and the smell comes back as soon as the next run is hosed down.

How do the two animal hospitals apply DRP Accelerator in their kennels?+

As the last step of a deep clean, after the runs are scrubbed and rinsed and with every animal out of the kennel area, the staff mix DRP Accelerator in an ordinary pump sprayer and spray it on the trough and down each drain. It is never sprayed while animals are present, and the runs go back into service on the hospital's normal deep-clean schedule.

What does DRP Accelerator do in a drain that bleach does not?+

Bleach kills what it touches on the surface and is gone. DRP Accelerator carries usable oxygen to the bacteria already living in the trough and the drain trap, so they keep digesting the waste after the crew has left, instead of running out of oxygen and gassing off. We add no bacteria and no enzymes, and the compound is consumed as the bacteria use its oxygen, so nothing of it stays in the drain.

Does it get rid of the ammonia smell from urine too?+

The sharp smell of urine comes from a different reaction than the rotten-egg smell of hydrogen sulfide, and we do not claim to neutralize ammonia. What both hospitals report is that the overall kennel smell is gone after the deep clean and the trough drain stays clean between cleans, because the waste that feeds every kennel odor is being digested instead of sitting there.

Is it safe to use around animals?+

Both hospitals apply it with the animals out of the runs, as part of deep cleaning, and that is how we recommend it. DRP Accelerator is an inorganic compound, not an oxidizer and not a chemical additive, and what we know about its handling and testing is on our testing and safety page. Anyone applying it should read that page and follow the hospital's own cleaning protocol.

Where else does the same approach work?+

Anywhere organic waste sits in a trough, a trap or a drain line without oxygen: boarding kennels, animal shelters, grooming salons, dairy parlors and wash-down drains, and the lift stations and force mains we treat for towns. The scale changes from a pump sprayer to a metered drip, and the biology is the same.

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