It all depends on where you live, here in Langley, 1 city away from abbostford, my TDS is at 5-13 depending on how much rain we get, TDS checked with 4+ tds meters. BC water is surprisingly good, thats why some get away with tap water for softies and LPS.
as for the RODI unit, did you backflush it? is there a restricting valve for the waste water on the unit that's fully closed?
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