The present invention concerns a dialysis acid precursor composition for use during preparation of a dialysis acid concentrate solution and for mixing with water and a bicarbonate containing concentrate into a ready-for-use dialysis solution. The dialysis acid precursor composition consists of powder components comprising sodium chloride, at least one dry acid and at least one calcium salt, and optionally potassium salt, magnesium salt, and glucose. In an embodiment, the at least one calcium salt and the optional glucose are present as anhydrous components in the dialysis acid precursor composition.
