Instructables

SHOWER FILTER FOR CHEAP Bad water make you itch? Make a great Shower Filter for 1/2 of buying one

Step 2: Remove shower arm from wall

Remove your shower arm by unscrewing it out of the wall. You may need a pipe wrench (put a bunch of tape on it so you don't scratch it all up with the pipe wrench).

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.
 
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