Most studied systems for photocatalytic applications are TiO2 thin film structures which photocatalytic activity strongly depends on the preparing method and post-deposition treatments. Sol-gel technique is one of the main techniques for the development of anatase thin films, since properties of the films can be tailored changing the solution composition and deposition process details. Recent review papers describe in details mechanisms of photocatalytic disinfection and solar reactors for photocatalytic water treatment, solar disinfection parameters, and illustrate inherent advantages and general procedures of sol-gel method for the preparation of photocatalysts. The aim of present report is to review the latest literature data analyzing the influence of each sol-gel coating preparation step onto coating structure and properties.