A deeper pool will not have any more problems with vacuuming within reason. If you can adjust your valves so that most of the water is being pulled through the skimmer you are using for vac. you will get better suction. 9-10 ft should be no problem. I have never had a pool cleaner without a booster pump so I can not comment, I can say that my pool is clean and I never have to manually vac.