To prevent further clumping happening with your PR3, we highly recommend storing it in the freezer or fridge. Please know that the clumping is due to the highly hygroscopic nature of some of the ingredients we use, which can cause the powder to absorb moisture from the air and clump together. This is a direct result of our commitment to using natural ingredients and avoiding artificial preservatives. However, we want to reassure you that the effectiveness and quality of the product are not affected by this clumping. But it does make it incredibly difficult to blend!