Inclusion Criteria:  Age over 18 years Upper urinary tract stones Stone density > 500 HU on CT (Mean Hounsfield Units of the largest stone) Ability to understand and provide a written informed consent to participate in the study  Exclusion Criteria:  Staghorn stones occupying renal calyces and pelvis Stone composition other than calcium, indirectly assessed or determined using the Hounsfield stone density units (a Mean Hounsfield score of < 500 units will be considered) Use of other urinary urinary stone treatments Use of magnesium supplementation Chronic kidney disease (CKD) with eGFR<30 ml/sec Pregnancy