Just a pool, disguised as a pond, with a trampoline instead of a diving board.
I wrote a paper about these kinds of pools several years ago for a class when they were just prototypes. These pools have a natural filtration system that run based on the plants that are in the pool that give the water nutrients that allow it to not only be crystal clear, but you are also able to drink the water because it becomes so clean. And the best part is that once the initial filtration system is installed and calibrated, it maintains itself and eliminates the need for chlorine or constant maintenance like salt water pools.
Favorite quote ever.
"All whales in captivity are all psychologically traumatized; it’s not just Tilikum."
"If you were in a bathtub for 25 years, don’t you think you’d get a little psychotic?"
"There’s no record of an orca doing any harm in the wild."
everyone needs to watch this documentary.