This pool makes your sims swim in staircases and on deckings, you name it. Only for decoration.
Be warned, it is extremely easy to take the pool level back to normal. 1 little faulty move and you have to do it all over again. Another thing I found out, it does not follow the lot to a new location. So you cannot download and place in your world, and you cannot move the lot if you make it yourself. Rather a blow to the hole idea. Then what’s the point?
Then I playtested the block I wanted to use. The stage tool.
For the record. I have game version 12.0.273.015001. A new patch may change this technic.