If low water pressure suggests a blockage or corrosion, is it typically a straightforward fix—scope the line, replace the offending section, and move on at modest cost—or does it more often signal hidden piping issues behind walls that demand full repipes costing several thousand dollars?

Would corrosion stop a snake from going through it?

After years of use, the zinc/galvanized coating diminishes, and corrosion begins.

There was corrosion and rust on accessible waste lines.

But if they’re slamming heavy pots down, scrubbing with corrosive cleaners, or overheating it to the point of warping, that’s tenant damage—plain and simple.The lease is the first line of defense.

We also have galvanized piping that didn't supply reasonable water pressure because of internal corrosion build-up, so we're replacing that too.

No, but that corrosion inside is a ticking time bomb.

I know ice melt is very corrosive on concrete and driveways and I personally don't use it in my house - even though my driveway faces North and comes with all the wonderful joy of shoveling.

I've heard of it being done in a steel mill water reclamation system where the original cast iron piping was rotting out inside of cement floors etc due to the corrosive/leeching by incoming low pH waste water.

Many circuits were simply taped rather than wire nutted so they fail from heat &/or corrosion.