If the granules can be easily broken apart in the bag, then you may be able to still use. If not, the bag may have absorbed water and you will be unable to apply.
We want you to be confident in our products. For this reason, we offer a product guarantee to our consumers. At your earliest convenience please contact us to see what can be done. You may visit our contact page by clicking on the following link http://tinyurl.com/7ag7a3n