I'm renovating the kitchen in our old ranch house. I started a couple of years ago with the bathroom and noticed the water had a gassy/oily odor and taste to it that I attributed to the really inexpensive faucet that I put in the sink. I've got the kitchen sink plumbed in now with an undersink water heater and the faucet is a more expensive, made in U.S.A. variety but the water is still tasting the same way as it does in the bathroom. I'm using galvanized pipe that I bought at Lowe's so, I'm guessing that's where the odor and taste is coming from. I only used oil on the pipe nipples I threaded myself and cleaned them very well before installation using teflon tape to seal the threads with. How long does it take to flush the odor and taste out of the pipes? We're on well water so it's not treated in any way and tastes great coming from all the old piping else where in and around the house. Is there anything I can do to "shock" the system to help speed this process up? The bathroom plumbing is now about a year and a half old and still tastes this way.

Need to replace some angle stops threaded onto galvanized. Some fittings look pretty bad, but moving a couple feet away, the ells look pretty clean. I would like to cut, unscrew and splice in copper with dielectric unions. I started applying penetrating oil Friday to the ells. What are my chances of this 1/2" pipe unscrewing? Should I torch it before trying.