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1ppm post di tds can be much worse than 1ppm post membrane and is IMO a cause for concern. Any tds reading indicates the di is no longer functioning and sustances afficed to it may leach in high concentrations as other ions displace it.
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Tom
Current Tank Info: Tank of the Month , November 2011 : 600gal integrated system: 3 display tanks (120 g, 90g, 89g),several frag/grow out tanks, macroalgae refugia, cryptic zones. 40+ fish, seahorses, sps,lps,leathers, zoanthidae and non photosynthetic corals.
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