There are mixed bed (color-changing) refillable cartridges that will reduce TDS to zero, or nearly so. I'm not sure this is the best way to treat drinking water but it can be done.
De-ionizing filters are most commonly used for commercial, laboratory and industrial uses.
What is your opposition to an RO? What is it you want your water to do (or not do)? I can see why many don't want a distiller as energy costs and low volume are not attractive.
Andy Christensen, CWS-II
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