Gowanus Lounge was kind enough to publish a list of Brooklyn pools. Check out his list.

It’s hot as hell. So, for what it’s worth, here’s a guide to the
location of city pools in Brooklyn. While the Astoria Pool in Queens in
probably the Gold Standard New York City pool, several of the Brooklyn
pools, including the one in Red Hook and the one in Sunset Park are absolutely huge.
MORE AT GOWANUS LOUNGE.