Kathy from Uniontown Pa writes,
Is Tupersan WP in 4lb paper bag 10 years old still effective?
I have 11 bags-It has been stored in the original cardboard box and kept very dry. Would it still be effective? What is the shelf life?
Tupersan 50 WP normally last up to 5 years if stored in a cool dry area. Please contact PBI Gordon 800-821-7925 to make sure that your product is effective or not.
Answer last updated on: 02/26/2015