Reefkeeping South Africa » Marine Aquariums of South Africa » TDS=7 - is this a problem?

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  TDS=7 - is this a problem?

  Posted: January 8th, 2012, 7:22am CST by ChrisNell

  I have a fairly old RO unit. Filters are new, but I still get tds=7. Is this going to be a problem in the long run?