Combined Use of a Medical Device and a Dietary Complement in Patient Urinary pH Control in Patients With an Implanted Double J Stent.

Patients within the experimental arm will receive dietary supplement Lit-control®pH Down to help them keep their urinary pH in the adequate levels, being these considered as the preventive ones to avoid stent calcification (pH\<6.2) being the 3 capsule per day indication. On the other hand, the control arm will receive a placebo product with similar organoleptic qualities and the same posology characteristics. Both arms wil use Lit-Control® pH Meter device to keep self- control of the urinary pH; also, both will receive the same hygienic-dietary indications about the care of the stent.