How long do CYA turbidity test chemicals last?


Jul 7, 2008
Like the title says, what is the effective age for CYA test kits? I think mine is 3-4 years old. (Reagent R-0013)

According to my cheapie test strips, my CYA is "at or over 100". But according to the vial test, it is between 60-80, and very likely right at 70. (I ran the test twice and think 70 is the dissapearing point) I of course trust the vial test more, but I do wonder about the reagent age.

Also, in general, how long would all reagents remain effective if stored out of sunlight?

Bama Rambler

Mod Squad
LifeTime Supporter
TFP Expert
Jun 23, 2009
SouthWest Alabama
That's a commonly asked question and the CYA reagent is probably the most stable. Even with it, 3 to 4 years is a long time. I'd order a new bottle if it's the oldest or it might be better to order a complete refill kit if the entire kit is that old.