ZAGREB, 22 March 2022 - Primary school pupils in the northern Adriatic town of Opatija marked World Water Day on Tuesday by throwing 13,800 biodegradable balls with effective microorganisms into the sea, thus also marking 138 years of the existence of the regional water supply and drainage system.

Effective microorganisms consist of a mixture of about 80 different microbial groups, mainly photosynthetic bacteria, lactic acid bacteria and other naturally occurring microorganisms that help maintain the natural balance in a habitat.

The campaign was organised by the municipal water management company Liburnijske Vode, while the material for the balls was provided by the Rijeka-based company "Efektivni mikroorganizam originalna tehnologija".

This was the fourth such campaign organised in the Liburnia region to mark World Water Day.