The bottom line assumption is the coexistence of amorphous precursor nanoparticles next to much larger scattering features such as struvite crystals, which contrastingly manifest themselves as Porod interfaces. This scenario is modelled by Eq. 3, where n ≠ 0. In Fig. , we evaluated how different amounts of 500 nm and 25 nm particles would contribute to a scattering pattern by varying n in Eq. 3, from 1% to 50%. Within our available q-range, we could only observe Porod interfaces at different intensities, denying any possibility to discern contributions from smaller amorphous particles among significantly larger ones, unless n, the amount of small spheres constitute a vast majority (n ~100%).