I purchased my Aquasana AQ-4100 shower filter from Sun Water Systems. The shower filter offers drinking quality water filtration of your shower water, filtering out chlorine, lead and other impurities which are unhealthful. I signed up to have my replacement filters charged to my credit card on a monthly basis to avoid being hit with a big bill every six months. Each filter costs around $50, but since I'm only charged $7 per month, I never miss the money.
This filter works like a charm. It not only filters my water so it's healthier and safer, it functions as a shower massage and cuts down the water flow to save water. It has both a regular spray and a pulse "masage" function which we use on a regular basis. My only complaint about the shower filter is that the assembly is rather flimsy and prone to breakage. However, I called Sun Water Systems and they replaced the assembly for free, and shipped it for free. I was overjoyed, since I really couldn't afford to pay to have that replaced.
I strongly recommend that you get an Aquasana shower filter to protect your health, keep your skin and hair soft and supple, and provide for your shower massage needs.