All water test reagents have a shelf life. Powders and crystals are very stable if kept dry. Acids last long. Storage conditions ae more important then date of manufacturer for reagents[1]. Taylor reagents are formulated to last at least one year.
Reagent Storage Conditions
- Store reagents at a consistent temperature between 36F-85F (2C-29C)
- Extreme fluctuations cause reagents to deteriorate
- Keep reagents out or prolonged direct sunlight
- Replace caps immediately after use to limit exposure to air and humidity
- Avoid switching bottle caps
