The effect of water back-flushing period (FT) and water back-flushing time (BT) was compared with the previousstudy of nitrogen back-flushing in viewpoints of resistance of membrane fouling (R_f), permeate flux (J), and total permeatevolume (V_T) in hybrid process of tubular ceramic microfiltration and PES (polyethersulfone) beads loaded TiO₂ photocatalystfor advanced drinking water treatment. As FT decreasing, R_f decreased, but J and V_T increased. Turdity treatmentefficiency was the maximum at NBF (no back-flushing) and increased a little as FT decreasing in both water and nitrogenback-flushing. Organic matter treatment efficiency was the maximum at FT 4 min in water back-flushing, but increased asFT decreasing in nitrogen back-flushing. As BT increasing, R_f and resistance of reversible membrane fouling (R_rf) decreased,but J and V_T increased. The turdity treatment efficiency was almost constant beyond 98% in water back-flushing, but increasedas BT increasing except NBF in nitrogen. The organic matter treatment efficiency was the maximum at BT 6 sec inwater back-flushing, but increased as BT increasing except NBF in nitrogen. The V_T was the maximum at BT 30 and FT2 min, and optimal condition was BT 30 sec per FT 2 min in this experimental range.