We had one of those pool vacs that crawl along the bottom (there are alot of different varieties of them) when I was growing up. Our pool was screened in (central Florida, mosquitos..need I say more?) I'd imagine a pool thats not screened in would pretty much require one of those things. Just a thought, im no pool guytuggerd;3323703; said:I need a pressurized filter sytem for that. I could do it though.