I - ahem - Bryan recently installed a water filter for the showerhead and it has done wonders for my hair. It wasn't until I felt how smooth and silky my hair was after a wash in the Pacific Northwest that I realized how dull and gritty my hair feels after a wash here in comparison. I had heard about using a filter for the showerhead and decided to try it for myself.
If your hair feels dull after a wash, or you have to use a lot of product to get it to cooperate, try a filter and see how it goes. I've heard it's even better for your skin too!