Been working on optimizing 'flow efficiency'. There are 3 pumps in the return section of the sump. 2 return pump + 1 smaller Vectra S1 pump that supplies water to all the reactors (eg. UV, sulfur, rowaphos)     Ideally all the filtered/clean water should return directly to the display tank & not get recirculated back through the reactor again. This is the same issue/challenge for reefers who pump water to a chiller and return the water back to the sump instead of dir