A.Al King responds: I agree with your plumber. Plastic pipe resists acidic water better than copper does, but it’s a "band-aid" solution — the root of your problem is the water, not the pipes. Even if all your pipes are plastic, the acidic water will cause problems with other parts in the system — riser tubes in the toilet, brass faucets, parts of the water heater, and so on. Also, acidic water affects the flavor of food and drinks made with it. So I advise installing an acid neutralizer (the most widely known is the Culligan system). That will cost about $1,200.

Acidic water aside, plastic pipe is still an option worth considering. But I would recommend cross-linked polyethylene tubing, not CPVC. The main reason to use plastic tubing in a remodeling job is to save labor, because it’s flexible enough to snake around obstacles. It usually requires less demolition, less drilling, and fewer joints. But CPVC...

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