Re: Shot glass method doesn't work with DPD?
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Originally Posted by
Poconos
Dilution works with any chlorine test. The OTO test has an upper limit so maybe that's why it was stated that way. DPD goes a lot higher. I do take exception with the tap water comment. Many municipalities chlorinate their water and that can mess up the results. Should use distilled water.
Thanks. I also wondered why Taylor suggests tap water, though the dilutions they suggest would only add a portion of the measurable Free Chlorine, skewing the test upward by perhaps .5 to 1 PPM FC. That's not too much if someone is diluting because chlorine exceeds the test's 5 PPM upper limit, but it does introduce error.
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Originally Posted by
waterbear
FWIW, if you are going to spend the money on a DPD test kit like the K-2005 you might as well spend a bit more and get an FAS-DPD kit such as the K-2006.
No argument from me! I was thinking of the shot glass / dilution method in the context of a pool owner's ad hoc attempt to measure high chlorine without immediate access to the FAS-DPD test, say, when fighting algae and waiting for their kit to be delivered.
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Originally Posted by
waterbear
I have never come across anyone who said you cannot do dilutions with DPD [...]
Thanks for the clarification. I just wanted to be sure.
Dilution works with any chlorine test.
16'x29' free-form 14K gal IG gunite pool; SWCG & sodium hypochlorite 8.25%; Hayward SwimClear C4025 cartridge filter; Hayward SP3202VSP TriStar Variable Speed Pool Pump; custom test kit based on Taylor K-2006C; city; PF:8.6
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