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