Phosphorus (P) losses from tile-drained agricultural fields may degrade surface water quality by acceleratingeutrophication. Among the different edge-of-field technologies, compact filter systems using different filtermaterials have been identified as potentially effective solutions for removing P from drainage water beforedischarge downstream.This study investigated the long-term (>696 days) P removal efficiency of 5 different filter materials in acolumn setup, using artificial drainage water (pH 6). Filter materials included two iron-based granulates (cal-cinated diatomaceous earth (CDE), ferric hydroxide granules (CFH)), and three calcium-based granulates (sea-shells, limestone, calcinated silicate/calcium oxide (Filtralite-P)). Experiments were performed under variableflow rates (0.037 and 1.52 L h 1; hydraulic retention time of 26–43 min and 18–30 h) and inlet P concentrations(0.14 and 0.7 mg L 1). An overall analysis revealed that the Fe-based materials achieved higher P retention thanCa-based materials. In particular, CFH was capable of retaining 99 and 98 % of the high and low inlet P con-centrations, respectively. Conversely, limestone retained only 25 % of the high P load. CDE performed moder-ately well, independently of the inlet P concentration. Filtralite-P and Seashells performed well at high inlet Pconcentration but relatively poorly at low P concentration. The sensitivity of filter material P removal efficiencyto variations in P loading was generally lowest for CFH and highest for limestone.