Open-air swimming pools attract diversity: they bring together people from various social, cultural and generational backgrounds. Given such potential to spark encounter, it is striking that these diverse spaces remain closed for a significant part of the year (approx. 8,7 months for all 10 Sommerbäder in Berlin between 2016-2018). All the more, as most of these seasonal voids are located either in the very center of dense urban areas or are at least easily accessible by public transport. Pool Potentials is first and foremost a comprehensive research on these spaces. It takes account of three levels of spatial analysis, but also reflects upon public and political discourses around open-air pools. In a further step - and based on interviews with organizers and activists from different self-initiated urban projects in Berlin - Pool Potentials outlines different strategies on idea placement, campaigning and implementation that shall serve as a toolkit for future activators of urban voids.