Help with Fas-dpd test results

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2001rotax800

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Mar 30, 2008
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Woops this was supposed to be a response not a new thread.

When I do a FAs-dpd test on my father inlaws pool, after I add the powder abd get the water to turn clear, I go to add the reagent and by the time I pick the bottle up, it is already turning pink again.


I was hoping to find someone else that this has happened to. Except mine turn's back to pink much faster. I get my 10cc of pool water add my powder, water turns pink I add the drops and get to clear counting the drops. Then I set the bottle down and pick up the reagent, by this time the water is already turning pink again, and when I add the reagent, it really goes to pink. I know doubt have CC issues, but I am still not very confident in my result's. This is on my father inlaws pool, 24,000 inground vinyl liner, using tablets. This was the first winter he used the safety cover, and it let a ton of junk in there. When he told me he needed help, it took me 4 days, with constant circulation, and 3 gallons of liquid Cl a day to get the CC under control, begining to look great now!!!

Thanks to all, for all the great info on this site.
 
After adding powder and FAS-DPD reagent getting it to clear, let it sit for 10 seconds or so, then add more drops to get it to clear, then wait 10 seconds or so, etc. At some point, it will mostly stay clear. Then, add the R-0003 reagent and see if it turns pink and how many drops it takes to get it to clear. If it's a lot of drops after R-0003 to get it clear, then the Combined Chlorine (CC) level is very high and was causing "bleed through" into the main Free Chlorine (FC) portion of the test. This is a known phenomenon and there's not much you can do about it if the CC is very high, but then again you need to deal with the CC in that case anyway.

You could also just keep the bottle in one hand and the tube that you gently swirl in the other hand so that it doesn't take as long between drops in the FC test. You could also use a 10 ml sample so that each drop represents 0.5 ppm so that the test will go faster.

Richard
 
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