How long do CYA turbidity test chemicals last?

G$

Member
Jul 7, 2008
13
0
#1
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
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TFP Expert
Jun 23, 2009
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#2
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.