25mm vs 10mm FC test
- Thread starter durtynacho
- Start date
- May 23, 2015
- 24,407
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
25mL sample size = 0.2ppm FC per drop of titrant
10mL sample size = 0.5ppm / drop
I typically use a 25mL sample size because I like the finer granularity of the test.
10mL sample size = 0.5ppm / drop
I typically use a 25mL sample size because I like the finer granularity of the test.
Yeah I know the difference in drop scale, just wondering if it works out to be the same accuracy.
- May 23, 2015
- 24,407
- Pool Size
- 16000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
If your talking about testing tolerance, then this is the official tolerance for all drop based titration tests -
When your drop count is ten (10) or less, the tolerance is +/- 1 drop. Anything over ten drops is +/- 10% if the final value in ppm.
That is the case for 10mL or 25mL sample sizes. Your "resolution" is technically 1 drop. But, because drop volumes can vary with squeeze pressure and people can get sloppy, the more drops you add tends to cause a greater accumulation of errors. Therefore the tests resolution (how many drops you count) is not the same as the testing tolerance.
When your drop count is ten (10) or less, the tolerance is +/- 1 drop. Anything over ten drops is +/- 10% if the final value in ppm.
That is the case for 10mL or 25mL sample sizes. Your "resolution" is technically 1 drop. But, because drop volumes can vary with squeeze pressure and people can get sloppy, the more drops you add tends to cause a greater accumulation of errors. Therefore the tests resolution (how many drops you count) is not the same as the testing tolerance.
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