Environmental Agents Control Act Article 20

Environmental agents vendors and general use environmental agents wholesaler suppliers and retailers may not store or sell unmarked environmental agents or sell environmental agents after opening the original packaging.
中文原文 環境用藥管理法第20條
環境用藥販賣業及一般環境用藥批發、零售業者,不得貯存、販賣未加標示之環境用藥或將環境用藥原包裝拆封販賣。

English translation for reference only; the Chinese text prevails. Not legal advice.