I have been using an Aquasana charcoal filter attachment for about a year. It's the same filter that Jonathan Antin (from Blowout TV fame) slapped his logo on and started selling at Sephora. I got mine directly from Aquasana for about 25% less.

Although it's a bit more utilitarian-looking than the one above, I've definitely noticed a difference in the way my hair and skin feels since I started using it and I would highly recommend it if you have problems with dry hair and skin.

i was JUST looking at these aquasana showerheads the other day and wondering if it is worth it. imoved into a new apartment and noticed my hair seems to be dryer and not as soft as it was before, and i think it is the shower water. glad to know it works!

One small thing I forgot to mention about the Aquasana filter....it uses a charcoal filter so be prepared for the water to initially come out grey. The instructions say to let the shower run for a few minutes to flush out the charcoal residue.

This only happens for the first 2-3 showers after I put in a new filter (and you only have to replace the filters every 6 months).

This is the first I've heard of Vit C filters...huh...anyway, I've been using the slim-line shower filter from this source for approximately 6 months. I have colored hair and had dry skin. This has made all the difference with my skin and has enabled the color to last longer in my hair therefore reducing the need for touchups......the price is excellent and maintenance is next to nil.

http://www.spritewater.com/