Hey folks,
Going back to that. I noticed that the resin in my DI unit was changing color fast lately, and saw that there was a jump in TDS to... 250! (normally it is around 46).
When pouring water from the sink, you can also see "bubbles" that are not there in general.
After checking first with the super of my building that it was not a local problem, I contacted the city, and their answer was interesting:
- there are currently some areas of the town which are getting water from the Croton Watershed, instead of the Catskill/Delaware one.
- the higher TDS is normal, and safe
- this is a temporary change, and it will roll back to the Catskill/Delaware basin, but they could not tell me when.
Side note: I live on the East 20's in Manhattan.
So... if you have noticed your water is different from what you are used to, that might be just that. They told me that they did get a lot of calls because "people have electronic meters and check it themselves nowadays".