I have a 60 gal tank with a 26 gal sump in the basement. I am pumping up about 10'. The specs on the 7 pump state 90 gph at 10' which seems to me to be not enough also during power failures the pump often will not pickup suction again unless the impeller is nearly new. I am considering going to the 9.5 however pump spec states 450 gph @10' with my 1/2" piping I am sure my rate will be somewhat less than the 450. The way I return water back to the tank is to pump to the bottom of the tank with a pipe across 50% of the tank with 3/16" holes to across the pipe to reduce any dead spots. I could use a bypass at the sump to reduce flow back to the main tank. What are others thoughts on going to a 9.5?