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. Said dialysis acid precursor composition consist of powder components comprising sodium chloride, at least one dry acid and at least one magnesium salt, and optionally potassium salt, calcium salt, and glucose. According to the invention said optional glucose is present as anhydrous component in said dialysis acid precursor composition and said at least one magnesium salt is present as magnesium chloride 4.5-hydrate (MgCl2．4.5H2O).本發明關於一種供製備透析酸濃縮溶液期間使用且與水和含有碳酸氫鹽之濃縮液混合成備用透析液之透析酸前驅物組成物。該透析酸前驅物組成物係由粉末成分組成，該等粉末成分包含氯化鈉、至少一種乾燥酸及至少一種鎂鹽以及任意地鉀鹽、鈣鹽及葡萄糖。依據本發明，於該透析酸前驅物組成物中，該任意之葡萄糖係呈無水成分，且該至少一種鎂鹽係呈氯化鎂4.5-水合物(MgCl2．4.5H2O)。
