I can't ofer any advice on the use of campden tabs.
However, my water also has a small level of chloramine in it (whithin government limits). I believe most folks who have a muninciple water supply do.
I use a large in-line water filter from Home Depot on my fridge water inlet line with quick disconnects. The filter performs well enough that you can tell a difference from the water straight out of the tap. Mostly, the chlorine odor/taste is gone in the filtered water, and there is no sediment at all.
I don't have hard numbers on my filtered water, but have heard repeatedly that if your chloramine and mineral content are whithin accepted limits, then a filter is all you need. My beers certainly back this up.
The plus side of this is now your fridge water and ice cubes taste and look great!
Pez.