Shabbos 151a part 2 – A Jew in the City(‘s swimming pool)
[BS"D] A Shabbos observing person cannot benefit from a melacha done for them on Shabbos by a Non-Jew. One has to wait a sufficient amount of time on Motzey Shabbos and only then benefit from it. As always, there are exceptions to the rule- both to the lenient and stringent sides.