I've got chloramine in my local water and read that using the tabs will get rid of that. I've seen folks say half to a whole tab for ten gallons. The package instructions say one tab per gallon.... thoughts?
I crush and stir, and either let it sit for a few hours ( although the reaction occurs pretty fast), or pour it back and forth between a bucket and the kettle a few times, just to make sure that as many of the breakdown products can offgas.
I read a little on the internet - not from a book - previously, and a poster on a site did some experimenting with campden. He said that he found the addition of campden resulted in immediate action so that chloramine was no longer detectable as soon as it dissovles. FWIW.