Dissolution of struvite calculi and reduction of relapses of struvite calculi. Urine acidification. The urine pH is controlled and provides the conditions for the dissolution of the crystals; The reduced magnesium content limits the formation of struvites; Reduced phosphorus content contributes to the development of urine unsaturated with these elements and reduces the likelihood of struvite formation; Reduced calcium content contributes to the development of urine unsaturated with this element and reduces the likelihood of urolith formation.