When I add my DPD powder I don't get any change in color. Is this because I have no chlorine at all? My powder was old and turned black so I ordered a new container and it does the same thing with the new powder as well.
Chlorine drop test
- Thread starter fordsbyjay
- Start date
Do you have an OTO test kit? If so, check the chlorine with that. If there's any chlorine in there it'll turn some color.
What are you running the swg at?
What are you running the swg at?
- Jun 14, 2012
- 2,668
- Pool Size
- 13500
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool Edge-40
FAS-DPD can report false negative (so I have read) and as Bama says above the OTO test (yellow side of the Taylor K1000 test block) is very reliable for showing if you have any chlorine.
I have the TF-100 kit and it includes the Taylor K1000 test block. I did the test with that as well and I have no chlorine. My question, I guess, is more directed towards the R-0870 DPD powder. How come it doesn't change to pink (or any color) when I add it?
If there's zero chlorine in the pool it won't change color because there's nothing to bind to. There has to be chlorine for the dye to work.
fordsbyjay said:
If you added the two scoops it pretty much means chlorine is zero. Put a couple drops of bleach in the sample and see what happens.
Ok thanks. I guess I have just never been that low before that there was no color change. I figured I was doing something wrong or there was a problem.
Well ... technically you are doing something wrong and there is a problem ... not checking the FC often enough and letting it drop to zero 
At this point, it seems that you need to start performing the shock process ... or at least raise to shock level and perform the OCLT to determine if there are organics in the pool consuming the FC as fast as the SWG can generate it.
At this point, it seems that you need to start performing the shock process ... or at least raise to shock level and perform the OCLT to determine if there are organics in the pool consuming the FC as fast as the SWG can generate it.
- Jun 14, 2012
- 2,668
- Pool Size
- 13500
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool Edge-40
march2012 said:
Another option if you have chlorinated tap water - drop some into the sample when you see no color change - it should immediately turn pink when you add the chlorinated tap water.
I went and had my T9 cell tested and it Failed which I guess explains the no chlorine situation...
thank you for the replies.
thank you for the replies.
- Jun 14, 2012
- 2,668
- Pool Size
- 13500
- Surface
- Vinyl
- Chlorine
- Salt Water Generator
- SWG Type
- CircuPool Edge-40
fordsbyjay said:
Grab some bleach while you are waiting to get it fixed or replaced.
If you don't get a color change when adding the R-0870, you should then add 5 drops of R-0003 to see if you have any combined chlorine.
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