I have a ion exchange bed at home, removed from service, and it is capable of producing really low dissolved ion water at low flow rates, abut does not remove any particulates ( the 0.3micrometer filter before it does that) or chlorine or other dissolved gases, which is done with activated charcoal filters after it. Good enough to use in batteries, I use it for the fish instead as it solves the needing to decholrinate the water. It gets down to around 0.1uS on the conductivity meter or better.
Soft water area, though with the kilometers of old asbestos cement pipe, old Victorian era cast iron, half century old concrete and steel tankage at the water treatment plants, along with the copper pipe and then the HDPE and polypropylene pipe in the ground and leading to the tap, along with the obligatory soldered connections and brass and cast fittings used, means there is a pretty high amount of ferric chloride added in plant to keep corrosion down.
The sediment filters go brown after around a day of regular water use, so just putting them in your water would be a good idea, especially if you live in NY, with the water treatment being essentially a big screen to remove pebbles, and there being a viable ecosystem living in the whole system, including small cocepod shrimp. Resin is expensive, but the filters are cheap. Buy industrial housings and filters instead of the overpriced ones sold for home use. The filters and housings, while unbranded, are the same ones sold in the big box store, and a lot cheaper, plus the store ones are 10micron only, while off the shelf industrial ones go down to 0.3 micron