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BTW the reason I was asking you - is because - about 10 years ago - I was using RO water - with no buffer - to do water changes to a discus tank (stupid). I'm not sure any fish - lives in an extremely low TDS - nor do I think that salinity probes measure TDS anyway. IMHO - neither of these products are great for what you're trying to do - but again - I'm not using them in freshwater