“…Existing research focuses on treating PFOA and PFOS (Meng et al, ; Yang et al, ; Yu et al, ; Zhi & Liu, , ), often using model waters spiked with one or more PFAS compounds at equal concentrations, commonly at higher concentrations than detected in groundwaters used as drinking water supplies. Only a few comparative PFAS removal studies exist in continuous‐flow adsorption systems in real groundwaters with ambient PFAS concentrations and ratios (Liu, Werner, & Bellona, ; Patterson et al, ; Schaefer, Nguyen, Ho, Im, & LeBlanc, ; Woodard, Berry, & Newman, ; Xiao et al, ; Zaggia et al, ).…”