I'm sorry I agreed with the 1/8 teaspoon, per quart. That's what I had been told to dose mine at. Looking over older posts, I see way more recommendations for 3/8 teaspoon per quart. Im glad mine were okay with the lower dose this spring. Whew.Dosage for Powdered Corid is 1 1/2tsp per gallon of water given for 5-7 days.
If you are mixing a quart at a time that would be 0.375 or 3/8 teaspoon per quart of water.
I like to change water for chicks several times a day, so just mix up a whole gallon. Make fresh daily.