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Originally Posted by Redlemon
Oh, and Brita filters now also contain "an ion-exchange resin" (I haven't figured out what that is) in addition to the activated carbon. They used to be just carbon.
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Many impurities are ions (charged atoms). Ion exchange media exchanges harmless ions for those of the opposite charge. Media may use one or another charge, or a combination, depending on the targets. Negatively charged media attract metals like iron, zinc, calcium. Positively charged media attract sulfates, etc. (Consult your favorite table of elements.) It works by adsorbtion like charcoal, so needs to be protected from the flow to prevent rinsing.
I haven't seen resins from fish supply stores but wouldn't be surprised if they're available. They both need pre-filters but it seems like resins would be a good substitute for or additon to charcoal.
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Originally Posted by BadNick
Besides making it taste better, I find that the extra filtering seems to really smooth out the after effects, like hangover, especially if I drink more than I should. I keep it in the freezer since I like it very cold with some good olives. I don't know if it's right, but I heard that the extra filtering removes "glycols" which are common in a lot of distilled liquors and these glycols greatly contribute to nasty after effects.
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I think this was proved sometime in the last decade. Can't remember the source but the explanation was similar to yours. Wish I'd known about it during my younger binge days.
