DIY TIME.... Here is what I did and I'm sure you can vary this a ton of ways.
Step 1: PARTS and TOOLS for Your New Shower Water Filter
(1) Whole House Filter (GE GXWH04F) $17.98
(1) Household Sediment Filter (We will get in to that more on the filter step) $ 4.00
(2) Reducer Bushing mipi x fipt 3/4 x 1/2 $ .63 ea. $ 1.26
(1) Pipe Nipple (Chrome, Galvanized, Nickel, ect.) Galvanized cheapest $ .92
(1) 6" Shower Arm (you may not need this if you can use your old one)
total cost around $25.00
Pipe wrench (smooth or put a bunch of tape on it)
Roll Teflon Tape
Step 2: Remove Shower Arm From Wall
Now put some teflon tape (so it won't leak) on the pipe nipple and screw it in the hole. You should have about 1 inch plus threads sticking out.
Step 3: Get the Filter Ready
Step 4: Put It on the Wall
Now put some teflon tape on the pipe nipple coming out of the wall. Get the filter body and screw the whole thing on. It can hang down or point up it does not matter.
Step 5: Put the Filter in the Body
At Home Chepo you can get 2 packs of filters:
15 to 30 microns for $ 7.99
5 to 15 microns for $ 8.99
1 to 5 microns for $ 11.49
I have been told that the filters that use charcoal as one of active ingredient are the ones that get rid of chlorine.
They all work good. Anything more you are going to kill your water pressure in your shower (thats Bad)
The most important thing I found is to get a filter with the big hole all the way though see pic 2.
If you have the small hole it will filter better but give you no water pressure see pic 3
Put the filter in the body like it sez in the directions that came with it.
..... and your done enjoy a cleaner shower.
NOTE: Look at my intro pic I also have a hose and valve attached to it so i can fill bottles up with filtered water.