Hydrogen peroxide is very widely used in the poultry industry as a water sanitizer. I know of about 20 million laying hens and four million growing turkeys that it is used for. We average selling about 1,800 gallons of 20% per week for that purpose.
We try to calibrate the injection of H2O2 so that at the end of a nipple drinker line about 2PPM remains in the water. In open drinking systems (much more subject to contamination) we like to see the water enter the trough at about 6PPM.
Since H2O2 reacts so very quickly with organics at those levels there is no chance that the intact substance can get much further than the tip of the birds tounge. In fact we tested two flocks of 20,000 pullets using so much peroxide that they could occasionally be seen foaming at the mouth a little bit. We saw no long term effects on them as layers. They perfomed as expected. All the claims about improvements beyond the mouth are exagerated. It just helps keep the water and watering systems clean.
H2O2 is much less damaging to the equipment when compared to chlorine.
We have some producers are going back to chlorine, in the form of gas, to sanitize water. There are situations where it works better.
Backyarders- Hydrogen peroxide is a good choice in many cases. Be careful with it. Personal injury can result if you are careless with the higher concentrations. Learn the science about it, and the safety precautions.
I have supplied many of my exhibition poultry freinds with 20% to use as hatching egg sanitizers and as a sanitizer in incubator water pans. All have improved results after using it.
Mac's comments above are right on point.
If I recall correctly the use of H2O2 in certified organic production is permitted without loss of status.