Therefore, the question arose how we can pinpoint the early stages of struvite formation in the absence of directly observable contributions from nano-sized species in the scattering curves that typically mark the onset of nucleation (and possibly the pre-nucleation stage). To address this issue, we emphasise that our scattering data include contributions other than Porod interfaces and that one must also consider the higher-q intensity changes, resulting from the structure of the aqueous medium in association with solid (crystalline)