Samson’s Fountain on Přemysl Otakar II Square in České Budějovice is the largest fountain in the Czech Republic. In the spring of 2024, tests of photocatalytic surface protection were launched on the fountain. Following positive results, in 2025 the surface of the fountain was treated with a self-cleaning FN NANO® coating.

This monumental Baroque structure was created between 1721 and 1727 to a design by the Jesuit architect Franz Anton Baugut; the work was carried out by the stonemason Zachariáš Horn, and the sculptures were made by Josef Dietrich.

Although the fountain is regularly maintained and restored – with expert supervision provided by the restorer Lukáš Hosnedl and operation overseen by ČEVAK a.s. – it contends every year with the appearance of brownish films formed by cyanobacteria and algae, in particular the species Chamaesiphon. These microorganisms, natural indicators of good water quality, nevertheless detract from the aesthetic appearance of the sculptural group from a heritage-conservation perspective and increase the demands on cleaning.

A breakthrough solution: photocatalysis without chemicals

In the spring of 2024, tests of photocatalytic surface protection were launched on the fountain. The technology uses daylight and titanium dioxide as a catalyst to break down organic dirt and microorganisms – without the use of any chemicals. Following positive results, in 2025 the surface of the entire sculptural section of the fountain was treated with an FN NANO® photocatalytic coating. At the same time, the water in the fountain’s circuit was also treated using technology with a photocatalytic effect, in order to ensure the system functions all year round.

This technology was designed and is applied by the Chrudim-based company eNecont s.r.o. , which since 2015 has been dedicated to developing and introducing sustainable solutions for heritage protection, indoor environmental quality and building microclimate. eNecont also acts as a certification authority for restorers and application firms in the field of photocatalytic coatings. FN NANO® applications take place with the expert technical support of Dr Jan Procházka, the inventor of these materials, which are now used worldwide.

Lasting protection, gentle on heritage and nature alike

Photocatalysis represents a revolutionary approach to heritage protection without mechanical cleaning or chemical agents. The technology is non-toxic, gentle on the substrate, respects the requirements of heritage conservation, and at the same time provides a long-term protective effect against biological attack.

Samson’s Fountain thus becomes a model example of combining Baroque art with innovative science – a demonstration that cultural heritage can be protected in a modern, environmentally friendly way and with respect for history.