Antidumping and countervailing duty orders have been applied to calcium hypochlorite from certain countries in the past. Importers should check the current scope of any active orders with CBP and the International Trade Commission before sourcing, as coverage and rates can change with administrative reviews.

Commercial calcium hypochlorite (solid or granular, typically 65–70% available chlorine) has its own subheading at 282810. Sodium hypochlorite solutions and other hypochlorites fall under the residual 282890. The distinction is based on the specific salt compound, not concentration alone.