Literally this thing is called a Kreepy Krawly because it CLIMBS WALLS LIKE A DEMON. But I mean, it's also a perfect pool pump that requires no tools to assemble and no electricity. Attach it to an existing filtration system and use a 1600 GHP pump for best use.
Promising review: "I've been a Prime member for years and yet I've never gotten off my butt and written a single review. Well, this product finally got me to do just that. I am a newer pool owner and am slowly figuring out how to maintain it. I went to old trusty Amazon and searched for highly rated automatic pool cleaners until I found this unit. The reviews were phenomenal, but at less than a quarter of the price of other pool cleaners, it was difficult to believe this could be that great. I am happy to report that this cleaner is everything it purports to be. I leave it plugged in my side vacuum port and it begins working as soon as the pump turns on. I have a large pool and run the pump for six hours every day and my pool is spotless. It works perfectly. Please take it from me, if you are looking for an in-ground automatic pool cleaner, save yourself $300+ and buy this unit. It works just as well, if not better." —Eric
Get it from Amazon for $79.32.