Precipitation is usually introduced in high school chemistry classes by mixing vigorously two liq- uids and observing the spontaneous formation of disordered, slowly sinking solid flakes. When this phenomenon occurs in industrial or geophysical environments though, precipitation forms large-scale cohesive structures sculpted by the flow: adhesive scaling building up in heat exchangers pipes, several tens of meters-high hydrothermal vents harbouring primitive ecosystems or perfect AI-looking travertin terraces found in Yellowstone are all but random flakes. How fluid flows influence the precip- itation process? This is the key question that motivates the present internship, whose primary objective is to investigate experimentally and theoretically the interplay between precipitation and hydrodynamics.