Quick Answer
A filtered showerhead replaces your existing showerhead. Remove the old showerhead, tape the arm threads, screw on the filtered showerhead, and flush. It is a single compact unit but commits you to that showerhead's spray pattern.
Problem
Filtered showerheads are simple to install but offer less flexibility — you are committing to the included showerhead, and the media chamber is usually smaller.
Product Recommendation
ZOOSHEN filtered showerheads are all-in-one units with replaceable cartridges. See the product specification for spray settings and cartridge life.