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HSD original block salt -9 packs. Each pack contains 2 salt blocks (18 in total), each block weighs 4kg Pure, Grade A / food quality salt (standard BS EN973) Our salt is made in the UK, sourced from trusted suppliers, and manufactured to the highest quality Water softeners need salt in order to regenerate and continue to efficiently remove the minerals that cause limescale Suitable for most standard water softeners that use block salt. (Please note, it is NOT suitable for the Arch Machine)