I have always been amused, in a dark and nauseating way, at the power of swimming-pool water in the USA to extract and distill the essence of pure racism - the chemist's "universal solvent" indeed!
Even here, north of the M-D line - with no actual Jim Crow laws on the books - Pittsburgh, city swimming pools were quite segregated into the 1970s. Then there was the public pool in suburban South Park - the black people were forced to go instead to the official "black pool" - a old dirty pool subject to flooding from an adjoining creek, called "Sulleys".
Then as recent as just a few years ago, a local private pool club in a Philly suburb (Media or Springfield or thereabouts) thought it would be nice and charitable to open their pool for organized trips that took kids to it from the poorer parts of Philly one afternoon a week. They must have known that the kids would be mostly black - but something about the sight of black skin coming in contact with the pool water caused the white pool club board of directors to cut the swim hours short and cancel the whole charitable venture. A bit of a fuss was raised, but being as they were a private club, no laws were broken.
I'm not making this up!