I have a 19k gallon pool with a tristar 2hp pump that runs for 3 hours at high speed and 9 hours at low speed. With this i have a Ultrapure UPP25 which requires me to set the SCHF (standard cubic feet per hour) air draw. The recommended SCHF is 5. if set at 4 or 5 in high speed its fine, but when it drops to low speed the SCHF drops to 1-2 due to lower suction. If i set at low speed then when it kicks up to high speed the pump will cavitate since its pulling in about 8 SCHF. How can this be resolved? Also, shouldnt the unit generate ozone anytime the pump is on? My pool builder had it wired so that it only generates on low speed.