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Hi @Rosalaine,
Before you do though, buy some calibration fluid and calibrate your TDS meters. Don't rely on the factory calibration which can be off. Reading 0ppm for distilled water is also not an indication of accuracy of readings higher up. I wouldn't do anything until you are sure sure that your tank TDS readings are correct. (From what you described, they don't seem a million miles off though given the TDS of your remineralised distilled water).
Thank you for this advice. I did not realize such a product existed and just ordered. I bought a cheap TDS meter and was using it more for a "ballpark figure" assuming it wasn't that accurate. I've been relying more on my GH and KH API drop tests with the TDS meter as a sanity check on top of that. The calibration solution will let me know if my $20 meter is any good! You can't really go cheap on a pH meter as cheap pH meters tend to be inaccurate, some wildly so. I'm hoping that with TDS you can go cheap, we'll see.
 
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