hello everyone! i need some advice/help on a small question. i can not
seem to find this specific step in any how to guides on the net. i
have low cold water pressure and weak flushing in my upstairs
bathroom. i know this is because of the old galvanized piping leading
up to the bathroom, my house is very old. i have found articles on how
to replace the piipes with copper and even how to unclogg the old
pipes. however, the step i am missing and i really need is how do i
know which piece of the galvanized piping to replace. i don't have the
money to replace all of the piping but i saw on a old HGTV episode
months ago where the host showed how to replace galvanized piping with
copper. he did something that showed him which piece of pipe was the
most coroded and needed replacing to fix the problem. it was about a
12 inch or less piece. if anyone could refer me to a web-site or could
tell me themselves step by step how to know where and which piece of
the piping to replace i would be very grateful.

thanks lulu