I don't know the answer to that either, but I just wanted you to know that someone read your post, and a screen over the pool sounds like a really great idea. That ought to keep a lot of the debris out and the hassle of cleaning to a minimum. Although, an automatic cleaner would take the hassle out too. I'm not sure of the price comparison between screen and cleaner, but the Polaris 3900 is roughly 140 bucks. I don't know, it might be worth considering. Hope that helps.