Lesson Learned....


LifeTime Supporter
May 10, 2007
Baton Rouge, LA
Lesson: If you keep adding chemical, and your test continues to show no change, at some point you need to doubt your test.

New pool. New test kit.

Not using salt yet.

Add calculated volume of bleach. A little change, up to .5 ppm.

Continuing to add cya, meanwhile adding more bleach.

And more bleach.

And more bleach.

Still .5 ppm Cl.

Wife: I'm beginning to doubt our test kit. I'm going to WalMart and buy another kit or more reagent.

New kit: Well over 5 pmm Cl. (last night)

This morning: Report from her lab: Well over 5 ppm

Evidently Cl reagent can go bad (or if not bad, at least neutral... which is.... bad), and sometimes does. Know that.



Mod Squad
TFP Expert
Apr 4, 2007
SW Indiana
Congratulations on passing your class in "Learning, the hard way." Whenever chemicals don't do what I think they should, I try adding them to a bucket of water and testing that. The small scale lets me make big changes in levels easily to see if things make sense.


LifeTime Supporter
May 10, 2007
Baton Rouge, LA
yep... my wife mentioned that she had meant to try adding a drop of bleach to the test to see the reaction... but it had slipped somehow....

must've slipped between doing the laundry, cooking dinner, work... or one of those cracks...

my naive self never doubted the test.


Well-known member
Jul 15, 2007
When you said "new kit," you meant the TF100 sold here or a walmart kit? In the case of walmart kits, who knows how long they've been sitting in storage and/or on the shelves.