Culligan ISH-200 In-line Shower Filter, Chrome for $21.11

Designed to make a good shower even better, Culligan's inline shower filter is perfect for the consumer who prefers his or her existing showerhead but has concerns about the water coming from that showerhead. The ISH-200 attaches easily to the existing standard 1/2-inch shower arm at one end and then to the existing showerhead at the other, without affecting the height or positioning of the showerhead.