In-situ velocity measurements were performed during potentiostatic Cu electrodeposition in different magnetic gradient fields (▶B). Astigmatism Particle Tracking Velocimetry was used to enable three-dimensional measurements of al three velocity components in a large part of the cell volume. A complex three-dimensional fluid flow was observed. Thus, the magnetic field gradient force (F_▶B) driven electrode-normal convection during deposition in high ▶B was experimentally proven and the interplay of F_▶B and the Lorentz force could be analysed for different ▶B-setups. Moreover, in-situ measurements of the ion concentration during deposition and dissolution of Cu in a magnetic gradient field were performed by Mach-Zehnder interferometry.