Do food and potable water grade resins have a limited shelf life?

Yes, all manufacturers have a recommended shelf life for their products and it can be obtained from the manufacturer. These assume the resins have been stored correctly, in line with the manufacturers recommendations. These recommendations normally include being stored in their original packaging, undisturbed, indoors, away from direct sunlight and not subject to extreme temperatures of cold or heat, but may have other specific requirements.

See more information on national legislation here.