Testing for chlorine - sample does not turn pink


Well-known member
Aug 13, 2015
Melville, NY
I opened the pool yesterday and put in 10 gallons of bleach 6% Sodium Hypochlorite, but when testing the water sample the next day, it does not show any FC, sample did not turn pink after I added 2 dippers of R-0870. i then took a cup of water half mixed with the same bleach and it also did not turn pink when I tested. Any ideas?


Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
Laughlin, NV
How old was the bleach? Though, depending on the condition of the pool water, it might have consumed that FC add of 19ppm overnight.

The second test would have bleached out the sample, so that does not count.


TFP Expert
LifeTime Supporter
Jun 12, 2009
NW Ohio
In the first instance you had zero chlorine.

In the second instance you created a sample that was 30,000 ppm, so it bleached out your test.


TFP Expert
LifeTime Supporter
Jan 6, 2010
San Dimas, CA (LA County)
Add the powder. If it doesn't turn pink, that means zero FC. Then add the R-003 and see if it goes pink. You might be turning all that FC into CC. If so, you want to know before you dump another thirty bucks worth of bleach in.