I have a 550 gal water tank that fills from my barn roof (metal). After a week or 2 or 3. i get a slight algea build up and the water gets a greenish tint to it. I use this water mainly for our gardens but the chickens get some in a separate 50 gal barrel that I run a hose to. Can I, and if so, add a small amount of chlorine to it to sanitize the water? I use chlorine to sanitize my beer making equipment at a rate of a cap full to 5 gal. Has anyone tried this? Of course I don't want to pioson the chicks. Just looking for a way to give them clean water without lugging it 200 yards every day.