食しょく塩えん不ふ使し用よう

• 減げん塩えん

  減塩 means 'reduced salt', implying some salt is still present, while 食塩不使用 means no salt was used at all.

• 無む塩えん

  無塩 also means 'salt-free' and is often interchangeable, but 食塩不使用 is more common on modern food packaging.

Compound of 食塩 (table salt) + 不 (not) + 使用 (use), literally 'no salt used'.