I'm using one of my OR6500 to Tee-off to my chiller and out to my sump! So in terms of flow, shd be more then sufficient! I started my chiller at 7pm yesterday and the tank temp is 33deg. This morning after 12hrs of continuously running, the tank temp is stuck at 29.3deg. I notice that there's a different of ard 2 deg between my chiller and my main tank.