We have been using Oxine in our poultry barn for over 5 years now and couldn't imagine raising poultry without it. We originally had to purchase it from the UK, but it is now readily available from online US suppliers including
Amazon. It's even locally available from breweries, and they have the best pricing as well.
Five years ago, our flock of purebred ducks came down with Aspergillosis. They were all on the verge of dying (or having to be put down) and our last hope was to isolate them to a small tented area and run Oxine (diluted of course) thru a regular store-bought humidifier 24/7 for about 3 days. They were all cured and we still have a few of them to this day! At that point, we started using Oxine on a regular basis.
We use Oxine in 3 different ways. The first and most common way we use it is in a sprayer. (Just a regular sprayer from any home/garden center). We spray down the barn every time we clean a pen or put new birds into an area where other birds were living - even if they only lived there for a few days. Not only does the spraying help with all the dust and dander that is normally found in poultry areas, but it helps the odors tremendously. Anyone who walks into our barn comments on the fact that they don't smell anything, even though there are 100 birds living in there. We try to spray down everything (and I mean everything) at least every few weeks, chore time permitting. If we have visitors to the barn, we spray the bottoms of their feet upon entering.
The second way we use it is in a fogger. After the scare with the Aspergillosis and dealing with all the leakage and breakdowns of the store-bought humidifiers and hand misters, we broke down and purchased the heavy-duty fogger that is specifically sold for use with Oxine. It works incredibly well and has been super reliable for years now! We are very impressed with this piece of equipment and it was well worth the hundreds of dollars that it cost. Whenever we have an outbreak of an upper respiratory infection in our birds (inevitable due to the cool/damp weather we live in), we start fogging every day. Combined with a treatment of antibiotics (and then probiotics afterwards), we are able to cure the sick birds and prevent the spread to the rest of the birds in the barn.
The last way we use Oxine is in the birds' waterers. It works especially well for the outdoor waterers that are exposed to sunlight and start growing algae almost immediately without the addition of Oxine. We don't keep the Oxine in the water all year round, but rather in spurts so it doesn't eliminate all of the good flora in the birds' guts. (Sometimes we put Merrick's ProBiotic in the water instead.)
Granted, we are still learning and tweaking our biosecurty system, but this past hatching season has been our best ever in terms of minimizing deaths due to illnesses to almost zero. We have to believe it is our diligent efforts in keeping the birds' pens & waterers cleaner than ever and using Oxine as part of our regular cleaning regimen.