Hello Brewers, In my latest brew I want to use a campden tablet to make sure the water is free of chloramine and free chlorine. I'm reading conflicting advice on how long to add the campden tablet (1/2 a tab in my case) to my water. I thought it had to be left overnight, but then some have said it's effective almost immediately. Any advice / thoughts on this? Would be grateful for any light on the subject.