I have been wearing the same trousers for work now for 3 years, no damage from pure water that I can find, ditto my polo shirts, not an iota of damage caused through water rotting holes through the fabric....
I'd not dispute that the hotter water gets the more likely it is to absorb CO2 from the atmosphere, cold pure water is also more likely to absorb CO2 as well (to a lesser degree of course)
But ultimately the water we use is only a tiny bit purer than rain water, hell there have been occasions when the water I've used hasn't been as pure as rainwater, ie, when my resin needs changing.
I wonder how long it is going to be before someone has a customer who tries to blame the window cleaner for their windows oxidising?
Now I know that it is caused by UV rays from sunshine of course, but no doubt someone will here of windows being rotted from pure water used by window cleaners and try and use that erroneous fact to sue their window cleaner for some nice new windows!!
Pure water isn't battery acid! The weak carbonic acid that it becomes is so weak that it is an insult to any decent acid to call it acid at all!! If it was then all rain would be acid rain, houses would melt, cars would be stripped of paint.
Water is of course an amazing substance, ultra pure water (waaaaay purer than the stuff we use to clean windows) freezes at several degrees below zero C, the purified water we use will happily freeze at zero degrees C (or as near to it as dammit) so in chemical terms it can't be that pure can it?
A mate of mine works for a police forensic lab, and he has said that the water we use wouldn't be pure enough for them, they measure it in parts per billion, not parts per million as we do.
As soon as I'm in a position to do so I'll be getting set up with some of hot water system...but not the Ionics thermopure that's for sure! (nowt wrong with it, it's just so bloody expensive!)
Ian