...Why would you want to use plastic instead of metal?...
There is no way to know if the water quality will change in the future and plastic is not damaged by anything in the water that is run through it.In my opinion, unless there are water conditions that corrode copper, using CPVC is being penny wise and pound foolish. Why would you want to use plastic instead of metal? You have essentially the same task of running pipes, solvent welding CPVC may be a bit easier than sweating copper, but only marginally. It is true that copper prices have gone totally crazy in recent months, but it is a superior product.
Personally I like PEX except for the well water line from the well to the pressure tank, that should be PE. I don't like PEX or CPVC to water treatment equipment.
I suspect the joints were not done correctly. I've taken out a fair amount of CPVC joints installing water treatment equipment, pressure tanks and well pumps and I've never seen any type of plastic solvent welded joints come apart.Glue eventually breaks down or becomes brittle. I just tore out a few hundred feet of CPVC and most of it snapped very easy, and some joints popped out with very little strain on them. ... it was all replaced with Copper. It will most likely outlast the house.
This is awkward, but...
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