Interesting.
I bought a 70yo home Aug 26 2022 that had 2 new 95% condensate Keeprite brand furnances installed in 2021 by a handyman on permit pulled by a pro. They did pass an inspection, fwiw...but the guy was a bit of a butcher...or at least, for the most part I do nicer work.
But I don't see where there could be a neutralizer. I've had reason to examine the condensate piping which leads a few feet to the floor drain, and its "effluent". This because the one was loose and had left a lime deposit trail over part of the floor for, I'm guessing most of the summer of 2022. In October 2022, I scraped it up with Olfa blades (used bare in my fingers) and did a CLR cleaner wipe and painted the floor. There was no etching of the concrete, all deposits just build up on top on the concrete- although it had been imperfectly painted many many years before, so that helped. New paint took perfectly- although is was Benjamin Moore Command, which is pretty amazingly great stuff. I found he'd made the pipes about 3/16" short, so they tended to work loose. After quoting the materials to redo them, I got smart (I think) and used the thicker of the clear plastic bump-stops made for cupboard doors and the like. I stuck them along the bottom of the PVC condensate tube. Now it's solid...rubbery solid, which IMO is perfect.
But point being, my experience was the condensate was mineral-heavy but neutral to basic. Could this be done internally inside the furnace? I can't suggest it to be code or regional related, as nat gas burns the same everywhere and is of AFIAK the same purity...although is the sulfur what leaves the ph so low?
It concerns me I get this right, as the 70yo floor drain in question goes under the majority of the finished basement's concrete floor, including a very expensive bathroom...and then into the main drain to municipal- & that goes under the garage.
I will say we're mildly alkaline soils here, regionally. Faintly possible our city did low-rank the concern of acidity.
