Do you know the right formula of Aluminiumacetotartraat ear drops FNA?

The formula is aluminum acetotartraatsolution 12% 10 g and purified water 90 g. Our Al-acetotartraatsolution (Burow) contains only 10% Al-Acetotartraat. So we take bus solution 12 g and purified water 88 g  

The storage is 2 weeks in the refrigerator. One gives the warning "to let room temperature Come" before use!