The advanced treatment of water can be achieved through sand filtration, activated carbon filtration, micro-retention with or without ultrafiltration membranes. The addition of these stages significantly enhances water quality by removing micropollutants in suspension from preceding treatment stages or even in the case of untreated water. This proves particularly helpful when strict limits must be met for specific pollutants or before other water treatment processes. It is a rapid, efficient, and cost-effective solution to achieve an effluent free of suspended solids and eliminate oxygen-consuming substances. Carbon filtration can be employed prior to ozonation.