This is deliverable 7.1 which reports on the ad-/desorption performance of different IEX resins towards short chain PFAA. The aim of the work carried out in this regard is to find appropriate resins that: (i) have sufficient sorption capacity towards PFAS and (ii) can be regenerated in aqueous solution, without an organic solvent, for multiple use. The best materials will be tested in a pilot plant at a waterworks located in Rastatt, Germany, where the groundwater used for drinking water production is contaminated with PFAS.