Salt air corrosion is real.  

I offered the tenant to hire a plumber, but unless it’s a defective plumbing issue like corrosion, they will be responsible for the cost.

I should probably let them know that I can hire a plumber and unless it’s an issue in the main drain, or something with the pipes (corrosion, etc), they will be billed for it.

Look out for joint leaks and pin hole failures due to corrosiveness of other metals joining to the copper and or metals in the water supply.

I recently purchased a pair of dewalt spring loaded needle nose pliers and sure it's a couple bucks more but the difference is night and day.Take care of your tools - the worst thing is rust or corrosion on tools.

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.