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Brine pools, it’s much saltier water which doesn’t mix with the water around it.
If it’s isolated from a current it would be filled with denser saltwater with a higher salt concentration until it eventually fills in with sediment
How about a pool of mercury or tetrabromoethane? Who said it has to be non-toxic. Besides, mercury comes with extra bling.
Heavy water
According to the Ancient Scrolls, an underwater pool would be filled with heavy water.
Watch out for tube worms.
Air and then water: First a large air bubble. We fill the air bubble with deck chairs, changing rooms, and palm trees.
Then, as a final touch, we put in a nice temperature controlled filtered and chemically balanced pool.
