Re: 10 ml vs 25ml or 44 ml Samples
If you are new to testing I would suggest using the 10 ml sample on the CH hardness test since this test can take a long time to do if your calcium is above about 150 ppm. This will allow you to see the color changes quickly (since they can take many drops of reagent to change fully using eh 25 ml sample.) Also, IMHO, if your calcium hardness is above about 300-350 ppm then a precision of 25 ppm is certainly close enough and a precision of 10 ppm is overkill, particularly if you are not worried about computing the calcium saturation index.
Retired pool store and commercial pool maintenance guy.
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