I did one pretty easy, just a short (4-5") length that threads into the outlet, a threaded coupler, a 90 corner and a 4 foot piece plus cap.
Thread the short piece in, thread the long piece on, align two rows of holes to shoot into the pool. Since my Extra outlet is in the shallow end, I had to have the extra threaded coupler because the pipe itself was to long to rotate in the shallow end. Basically the holes go from about a foot above the water up the pipe to the cap about 3 feet above the water.
I did this initially to cause evaperation on those extremly hot summers to lower the water temp. It would take down from 98 to about 96, not great, but better.