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Message: [QUOTE="vertigo72, post: 65714, member: 3094"] Hmmm... but why would you want a low TDS? We are adding all kinds of stuff to our water to increase our KH, GH and even salt levels. All of these are dissolved solids increasing your TDS reading. So whatever your TDS reads, you ought to subtract the things you [I]do [/I]want in the water, and only then there might be measurement of dissolved solids that you dont want. Just wondering, like what of those would accumulate over time? Nitrates if you dont have (enough) plants? What else? [/QUOTE]