Schedule 80 vs 40 CPVC
digitalplumber,
I did a replumb of my house about a year ago with PEX and did have some experience with strong plasticy taste, and in some cases odor. The taste and odor were definitely related to how long the water stayed in the pipes. On the filp side they went away over time, or if usage went up. I stopped noticing the odor after a few months. The taste took around 9 months to go away. Though I did notice a few hints after coming back from vacation. After that initial time frame, if you don't notice the difference between drinking from metal and plastic water bottles, you won't notice the difference from the pipes.
As I mentioned, usage also makes the taste/odor go away. About a month after the replumb my parents came to visit. So my 1 bathroom house went from supporting just myself, to the three of us. For the duration of the visit, I only noticed the barest hints of taste/odor if I was the first to use something in the morning. As soon as they were gone the taste & odor came back just a bit below where they were before their visit.
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