My old pool was 24,000 gallons and I used a Polaris 380 vacuum which ran an hour a day. Since the Polaris kept the bottom spotless but there was always a little debris on the surface, after extensive testing I finally removed the diverter from the skimmer basket, which seemed to solve the problem. I've recently had the pool and surrounding area completely renovated and it is now a 7,100 gallon pool. Interestingly enough, I'm finding the same thing to be true - now running only 30 minutes a day the Polaris keeps the bottom spotless but there's light debris on the surface. Again I've removed the diverter valve which solved the problem. So my question is this: is it OK to run the pool's cleaning system with no diverter valve in the skimmer? If not, why not?
BTW - if you'd like to see pics of the full renovation effort, check the link below in my signature.