Eco salt block (sodium) food NF high quality compact block for ECO water softener new generation and compatible water softeners. Made from a very pure refined salt. They are specially designed to soften water for human consumption and food. Each block weighs 2.3 kg. Size of a block: 20 cm x 10 cm x 6.5 cm. One package contains 4 blocks and weighs 9.2 kg.