Posted by Jeff Dayman on 08/12/2017 19:37:28:
this happens a lot on cheap 300 series stainless sheet raw material from China. When I worked for a firm doing instrument washers for medical and dental markets we had a few wash chambers every year (out of several thousand built per year ) that developed pinholes or bad staining after a few years use. The occurrences did not seem to be related to water in different regions, or soap used , etc. The weldability of the stuff varied a lot too. Price was right but quality was not consistent.
Given the high cost of your sink I would definitely make a warranty claim. If genuine 300 series stainless of good quality, it should last essentially forever without corroding, even if you leave it in the woods outdoors.
As others have said though, keep iron filings out of it and isolate any non-ferrous pipe fittings from it to prevent any galvanic action.
That's interesting Jeff – thanks for the thoughts. It does sound like a problem with the raw material then.
Of course, these "50 year" guarantees may be like the classical "lifetime warranty" ie most people don't even know / remember they had one and of course once the house / car etc changes hands it becomes difficult to prove you bought it or it was formally sold on to you. In this case I doubt it's been in production for 50 years, so surely there can't be any question that a claim would have merit.
On the face of it, I also seem to have incurred additional loss ie the carcass of the cupboard has ended up getting trashed due to the resultant swimming pool environment that I have to say I was struggling to fix. Must admit I was gobsmacked to discover the thing looks like a sieve. Last thing I was expecting – and me an engineer, silly me.
Murray