Under this motto derived from an ancient Greek poet the subsequent meeting of the Polish Hydrobiological Society will be held in Poznań. For many years, hydrobiologists have been emphasising that protection against pollution is one of the main issues of the national economy. They have stressed that water resources are limited mainly by its poor quality. A number of proposals put forward by the Polish Hydrobiological Society for a long time have been implemented as late as after political and economic transformation in 1989. Higher efficiency in establishing and implementing appropriate water management policy can be expected after the water law comes into force.