Yes, you can recharge them, but it's an ugly process. I recall it's hydrochloric acid and lye(?). I used to do it years ago, but I would do several at a time, and if you do it indoors, you're likely to kill your family with fumes. And burn stuff with acid. And you have to neutralize the mixture before disposing of it, and I doubt it's good for your plumbing. And it sucks doing it.
Buy a cheap RO unit, you'll be much happier.
If you insist on it, Google API Tap Water Filter recharge
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Brad
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