Every barn manager knows the routine. The birds move out. The crew moves in. Power washing, scrubbing, disinfectant spray. Hours of labor, clouds of chemical, and by the time the next flock arrives, the barn looks clean. But looking clean and being disinfected are two different outcomes of poultry disinfection.
But post-wash testing tells a different story.
A clean barn is not a disinfected barn. Post-wash sampling consistently shows bacterial loads persisting in the places cleaning can’t reach.
At HS Ultra, our approach to poultry disinfection starts with data. We’ve conducted post-wash baseline testing across breeder and layer barn facilities before applying our ozone protocol. What the swabs show, time after time, is that conventional washing leaves significant bacterial loads behind in the exact zones that matter most for the next flock.
What post-wash testing actually reveals about poultry disinfection
After a thorough conventional wash, with cleaning protocols followed correctly, our baseline swabs have recorded:
- AI pits and panels: TNTC (Too Numerous to Count) bacterial colonies
- Floor cracks and expansion joints: TNTC
- Exhaust fan rooms: 50,000 to 75,000 cfu/mL
- Nest quadrants: 50,000 to 75,000 cfu/mL
- Tunnel fans: 25,000 to 50,000 cfu/mL
- Feed lines: 1,000 to 10,000 cfu/mL
These results come from a fully washed barn. Cleaning protocol completed. Everything that a pre-flock checklist would call done.
The bacterial loads aren’t there because the crew didn’t do their job. They’re there because washing, even thorough washing, physically cannot reach every surface, crack, overhead structure, or ductwork zone that pathogens colonize between flocks. Salmonella, in particular, doesn’t need much to survive a changeover cycle.
Why washing isn’t poultry disinfection
Washing moves contamination. Disinfection destroys it.
Water and mechanical scrubbing dislodge organic material and reduce visible contamination. But in porous surfaces, floor cracks, AI pit gaps, and equipment crevices, biofilm-protected bacteria survive the wash and carry forward into the next production cycle.
Traditional chemical disinfectants, chlorine dioxide, peracetic acid, formaldehyde, have historically addressed some of this gap. But each comes with serious constraints:
- Formaldehyde is an IARC Group 1 carcinogen. It’s banned in hatcheries across multiple countries, and US restrictions are tightening. The transition away from formaldehyde is a matter of when, not if.
- Chlorine dioxide and peracetic acid can reduce loads but leave chemical residues on nesting systems, feed lines, and hatching equipment that carry into the next flock.
- Both require significant dwell time, ventilation periods, and evacuation: up to five days of downtime per treatment cycle.
- Neither addresses resistance. Pathogens that survive repeated chemical exposure can adapt. Ozone cannot be adapted to. Its oxidative mechanism destroys cell walls non-selectively.
What happens after the HS Ultra ozone protocol
After applying gaseous ozone following a conventional wash at the same facilities where we recorded those baseline numbers, post-treatment results showed:
- All treated wall surfaces: No Growth
- Drinkers, feeders, and feed lines: No Growth
- Tunnel curtains and vents: No Growth
- Exhaust fans and cool cell rooms: No Growth
- All nest quadrants (NE/NW/SE/SW): No Growth
- Salmonella across all sample points: Zero detected
From Too Numerous to Count to no growth on every treated surface. Validated by third-party accredited poultry health laboratory.
These results were validated by the client’s own Director of Laboratory and Microbiology Services, not just by us. The reduction in bacterial load is statistically significant (p < 0.00001), and the results have been reproduced across multiple barns and sampling events.
The mechanism is straightforward: gaseous ozone reaches every cubic foot of barn space. Wall surfaces, overhead structures, ductwork, equipment. Everywhere air flows, ozone reaches. It eliminates what the wash leaves behind. And because ozone reverts to oxygen, there is no residue, no off-gassing period, and no chemical carry-over into the next flock cycle.
The operational case
Beyond the microbiology, the operational advantages matter:
- Barn turnaround in as little as 8 hours, start to finish, same day, no mandatory aeration period
- No evacuation required beyond the treatment window
- HS Ultra administers the protocol, integrating directly into your existing changeover workflow
- No resistance development. Ever. Ozone’s non-selective oxidative mechanism means pathogens cannot adapt
For operations running tight changeover schedules, the difference between a five-day formaldehyde cycle and an eight-hour poultry disinfection protocol using ozone is significant. And for operations managing compliance pressure around formaldehyde, it removes the regulatory headwind entirely.
A note on porous surfaces
Gaseous ozone penetrates air spaces extremely well. For porous floors, concrete expansion joints, and surfaces that ozone gas doesn’t fully saturate, HS Ultra also deploys aqueous ozone as a targeted surface soak. Used together, the two protocols close the coverage gap that fumigation alone leaves behind.
Ready to see the difference?
HS Ultra provides site assessments for poultry operations. We review your current biosecurity program, identify high-risk zones, and deliver a tailored proposal with before-and-after sampling built in. The lab results speak for themselves. Learn more or contact us today.
