The garlic helps to lessen ammonia in their droppings and it, along with the other herbs help to boost their immune systems, particularly respiratory health.
This piqued my interest, as I've heard many benefits of adding a small amount of garlic to chicken feed, but hadn't heard this one.
Horse bedding pellets absorb and dry out urates before they can turn into ammonia, so I don't need to do anything else. That said, I did some research on garlic.
Overdoing it with garlic can be toxic to them, but I think if someone's eggs start tasting like garlic, that may be a sign they're giving a little too much.
Garlic is a potent natural prebiotic that supports gut health and may reduce ammonia/odors.
But what surprised me even more were the studies on giving chickens garlic for other purposes. It is a cure for nothing; it does not kill worms/parasites/mites, but it may reduce the worm load. For mites, it only works topically if made into a spray. For worms, again, it may reduce the quantity. A dewormer is necessary to kill worms.
But according to studies
published in Poultry DVM, adding garlic to the diet of chickens may help prevent ascites syndrome. Again, not a cure, but
may help prevent ascites. I've never had a chicken with ascites, but if I was seeing a pattern of it, I'd surely start feeding the appropriate amount of garlic to my chickens!
As for slime/algae in their water receptacles, we add 1/2 teaspoon of RV water freshener to our 5-gallon nipple buckets, or a few drops to the smaller ones. We had issues, but that works.