Many thanks for the detailed response!!
As for the TDS measurements, your explanation made me realize that I've been misinterpreting the readings from my TDS meter.
I have a HM Digital COM-100, which I've purchased quite a while ago, based on some recommendations.
However, I must have lost the manual, but I'll try to look for it online to see how it should be used properly (it has both a 0.5 and 0.7 conversion factor).
At least for the other water parameters I am using a droplet kit with the conversion table, so I hope I have the correct values there
With your water recipe, I'm quite intrigued.
It looks like a very balanced one.
However, after reading the part about your Giotto, I'm not sure whether you were talking about 2 different recipes (the first being for brew and the second for espresso machine) or they're the same one. Because you first mentioned mixing everything in a bottle and then described a different routine with your machine.
homeburrero wrote:...which appeals to my paranoia about brass and copper corrosion in my older espresso equipment.
what happened with your older espresso equipment?
What was wrong with your water back then and how long did it take before the damage became apparent?
Were there any health risks involved as a result?
homeburrero wrote:I've let it go too long and noticed that fishy odor. I sometimes see some resin beads or charcoal break through into the top part of the filter jug, but have never seen them down in the filtered water.
It seems like you're describing having occasional phenomena with the filters, as some users have mentioned in their negative feedback, but it sound like it's nothing to be worried about. Good to know.
I've seen someone mentioning using 2 jugs of ZeroWater, when he uses an old filter (that showed 006 on the TDS meter) in the first one to get the TDS of the tap water down (it will not reduce the TDS to 0, but according to him it can still reduce it). Then he would filter the same water again through a fresh filter, which will reduce the TDS to 0. He claims that this enables to use the fresh filter for a longer period.
Any thoughts about this? Even if this works, I couldn't understand whether this fishy odor will go away after the second filtration.