Downsides to salt pools

[chem geek]

And 316L is marine-grade salt-resistant stainless steel! So it would indeed be very good to get to the bottom of that customer's particular situation. In addition to checking the chlorine level, be sure to check the pH and also see if the stainless steel has been bonded to other metal exposed to the water. If the chlorine level and pH seem OK (ah heck, check the CH, TA, temperature and salt level as well, while you are at it) and the steel is electrically bonded, see if you can put a current meter between the bonding wire and the steel (assuming it can be easily removed -- or put a voltage meter between the steel and a grounding wire or ground post). I'm just thinking about different possibilities -- stray currents (and voltage) could be an issue, though I'll bet you are right that it's just high chlorine levels.

Richard