I am haveing a problem when running my Haward pool vac. When running the vac the pressure in the filter is about 10lbs. When I switch to the skimmer the pressure is about 20lbs. The problem is my heater cycles on and off when using the vac. I have about 30' of hose to the vac. if I unplug the vac and leave the hose I still only have 10lbs but if I remove the hose the the pressure goes back to 20lbs. Could it be that it just can't suck enough water through the hose? Maybe a larger diameter hose? I get good suction on the vac and it will climb all the way up the wall.