We have PP pipes in our apartment that were installed about 15 years ago. Recently, microcracks started appearing and water's been seeping through. Do we need to replace the entire plumbing system at once, or can we replace it section by section as needed? And which pipes should we choose - stick with PP again or switch to PEX/aluminum composite?
The question is kind of off-focus here - the real issue isn't the material choice, it's understanding that if pipes are cracking all over your apartment, it means the material has reached the end of its life, and replacing it piece by piece is just postponing the inevitable. I'd recommend doing a first pass and replacing the main lines all at once, then handling the branch lines as needed later.
As for the material - if PP lasted 15 years, that was either not the highest quality option or polypropylene with filler. Metalplastic is more reliable, doesn't degrade from UV and lasts longer, plus it's easier to install without special equipment. But the main thing before you buy anything is to check the inside diameter of your old pipes and calculate the pressure so the new ones match the specs.
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