A Cheap Pool Cooler

[Poolsean]

"This is a great idea, but my inground pool is old and has no eyeball fitting. The returns appear to be simple non-threaded openings in the side of the pool. Can I remove the existing non-threaded pipe that seems to be in the returns, or do I need to do something to get a threaded pipe in place? Any ideas would be helpful."
Years ago and still done today, a slip fitting was used. This was not threaded, but rather, just a compression fit into the 1.5" pipe. You may not be able to do this aeration cooler with those types of returns...

[noworries]

I got inspired by your post as well. Any ideas if it's possible to get something to attach to a copper return?

Edit -- I found I can wedge 1/2" PVC in one of my returns. It's kinda odd--it enters the pool at a 45 in the middle of the pool. Gotta go get some more 1/2" PVC and some elbows and T's and have some fun!