I found this article in a cichlid forum and thought it would be beneficial for us all.
Many many thanks to MudbugnLouisianna for e-mailing the companies and compiling this list.
1. Aquarium Pharmaceuticals
Test Solutions Shelf Life from bottling date
Wide Range pH Test Solution 3 years
Ammonia Test Solution #1 3 years
Ammonia Test Solution #2 3 years
High Range pH Indicator Solution (m-Cresol Purple) 3 years
Nitrate Test Solution #1 3 years
Nitrate Test Solution #2 3 years
GH Test Solution 3 years
KH Test Solution 4 years
Nitrite Test Solution 4 years
Fresh Water Ammonia Test Solution (Nessler) 5 years
Fresh Water pH Indicator Solution 5 years
High Range pH Indicator Solution (Cresol Red) 5 years
Salt Level Test Solution #1 5 years
Salt Level Test Solution #2 5 years
To determine bottling date check the lot # on the reagent bottle. The last 4 digits are the month and year of bottling.
Example: 33A1201 would = a bottling date of December 2001.
If you have any more questions please contact me.
Technical Services Representative
All of our test kits have a shelf life of four years. Each package is marked with an expiration date. Please reply if you have any further questions.
Sharon Emond, Customer Service Dept.
Rolf C. Hagen (USA) Corp.
The kits have a five-year shelf life. Once you open them you should discard them after a year. If you would like us to trouble shoot further please call 800-526-0650 option 1 M-F 8-5.
Tetra Consumer Relations