Quote:
Originally Posted by cousinkenni
Flora,
How calibrated do I really need it? This is a simple observation, and to me if I take something that has 50ppm dilute it 50% with RO water to 25ppm that seems pretty calibrated to me. I don't care about absolute values I only care about relative values and for this purpose an uncalibrated test kit will work fine. I just want to know what if anything is causing 1) the KH to increase or 2) if the KH isn't increasing what substance that is being produced in the tank causes the KH kit to be innaccurate.
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You should always calibrate ALL your test kits, otherwise, you simply have no idea what the readings are, KH test kits, as with all test kits can vary greatly from kit to kit, and also they loose accuracy over time. Where your reading 25ppm, it could be 5, or it could be 40, who knows.
This is why we use known KH solution in our drop checkers, because we cant rely on the test kits to do that job for us.
So my point is.. you might be worrying about a reading that actually is very low, and thus, completely normal. I do see your point though on wanting to know whats altering it, but thats a separate issue to the point im making.