Calcium Hypochlorite — China — C-570-009

“Calcium Hypochlorite” is a product description used in a U.S. trade measure classified as AD/CVD. AD means antidumping: it addresses imports that the government determines are sold in the United States at less than fair value. CVD means countervailing duty: it addresses imports that benefit from certain foreign-government subsidies. These duties are separate from ordinary customs duty and may apply in addition to it.

The measure typically affects U.S. importers bringing covered calcium hypochlorite products from specified countries or exporters, as well as manufacturers, distributors, and retailers that rely on those imports. Whether a shipment is covered depends on the legal product description, country of origin, exporter or producer, and applicable scope and entry requirements—not just the product’s commercial name. An importer may be responsible for declaring the correct tariff classification and paying any applicable additional duties, with possible later assessment through liquidation.

Reviewing the official measure is important because AD/CVD treatment can vary by exporter, producer, country, product form, and scope language. Classification under the Harmonized Tariff Schedule of the United States (HTSUS) helps identify the reporting provision, but an HTSUS number alone may not determine coverage. When the scope is unclear, obtain guidance from U.S. Customs and Border Protection (CBP), the administering agency, or a qualified customs broker or trade attorney.

What to check

• Check the official scope language for the measure, including the chemical description, concentration or form, packaging, and stated inclusions or exclusions.
• Confirm the product’s country of origin, manufacturer, exporter, and any applicable producer-exporter combination; do not rely only on the seller’s location.
• Verify the correct HTSUS classification and determine whether the measure requires an additional AD/CVD entry or reporting procedure.
• Ask your customs broker to review the applicable instructions and ensure the entry includes the required case or measure information without assuming that ordinary duty treatment is sufficient.
• Keep technical specifications, invoices, origin records, and supply-chain information that support the coverage and classification analysis; seek a formal ruling or professional advice if the scope is ambiguous.