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Refrigerator filters do very little for removing TDS, probably 1% at best. TDS stands for Total Dissolved Solids with the key word being Dissolved. Rferigerator filters trap TSS or Total Suspended Solids or what is know as sediment and particulates. Thye als occontain some carbon for taste and odor control which removes some of the chlorine. The do absolutely nothing for dissolved solids. Do not believe anyone who tells you a Pur or Britta type filters is as good as an RO/DI as it just is not anywhere near true.
Nothing is a close substitute for an RO/DI system.
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