Looks like a round-about way of saying MP concentrations vary by water source, think most people could come to that conclusion without a study.

Missing water sources for bottled (just states it's from French suppliers) and only one tap source sample for comparison. This is just a snapshot in time, would have preferred multiple samples averaged over time from both the bottled and tap sources.

It didn’t occur to me microplastics were plastics on the “micro” scale with varying sizes. It all makes sense just never gave it much because I haven’t read about them in a proper scientific context.