TF-100 chlorine test


New member
Jul 31, 2010
Why is my chlorine drop test so inconsistent when my chlorine levels are super high (42.5)? I test and get 1.5; knowing this can not be correct I test again and the water sample will actually trun dark pink and I get 31. Is there a problem with the test kit or is the problem that my cholorine so high? I am super cholorinating to get rid of algae introduced my frogs jumping into the pool. Any help would be appreciated.

Bama Rambler

Mod Squad
TFP Expert
Bronze Supporter
LifeTime Supporter
Jun 22, 2009
SouthWest Alabama
Are you using 2 heaping scoops of R-0870 powder? With chlorine that high you need to scoops to bind it all.
Why are you keeping your FC that high?
What's your CYA level?
If you're not able to test it how do you know that the FC is 42.5?

What are the rest of your test results?
pH (but don't bother testing it with FC this high)

By the way, you didn't get an algae outbreak because of frogs jumping in your pool. You got it because your FC wasn't maintained at the proper level for your CYA.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
Your inconsistent results are almost certainly due to not using enough R-0870 powder. Higher FC/CC levels require using more R-0870 powder.