Yes. Sea-90 is an all-natural, unrefined sea salt. Because we don’t process or artificially heat Sea-90, it retains a low level of moisture that can cause limited hardening and clumping. If this occurs, the bag can be lightly dropped onto a firm surface, or the product can be broken up by hand. Clumping may be more common in high-humidity environments or during periods of low temperatures. Even after hardening, Sea-90 will fully retain its mineral and trace element content, and still offer our unique benefits to your soil, plants, and animals.