Re: Pool Test Kits
Yes, I wasn't recommending using a 25 ml sample with 0.2 ppm precision and accuracy, but rather that you COULD be that accurate if you wanted to and that it says something about the quality of the test. Most people use a 10 ml sample for 0.5 ppm precision and accuracy which is fine in most circumstances. For my own pool where I find the 0.2 ppm resolution useful is in two situations: 1) when I want a better handle on the Combined Chlorine (CC) level which is always very low in my pool (i.e. I want to know more than just <= 0.5 ppm; I want to know if it's <= 0.2 ppm) and 2) when doing an overnight chlorine loss test since such losses are also low or even when doing a daytime loss test. These latter loss tests are useful for figuring out average chlorine demand to the point where I can even tell when my wife has peed in the pool (see this thread, for example).
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