Originally Posted by Chris J
The term "efficient" is being used in two different ways. On Mr.X's side efficiency is being used to describe the skimmers ability to pull out DOC
's where as on Jeff's side he's using it to describe power consumption vs the amount of DOCs pulled out. Mr.X is correct in stating that one skimmer does NOT effect the others ability to pull out DOCs it just causes there to be less DOCs which in turn causes the other skimmer to be unable to pull out as much because there simply is nothing left for it to skim. It doesn't make the skimmer less efficient, it does however mean you are powering a piece of equipment that isn't working at its full potential thusly making it "inefficient" to run. In summary, I side with Mr.X, two skimmers in a sump setup don't effect each other, they both effect the water so when one pulls all the DOCs it appears as if the other is less efficient only because there are no DOCs left to pull out and the skimmers did their job "efficiently" but it is "inefficient" power consumption wise to run a skimmer that isn't skimming or only skimming half the amount it could... Clear as Mud I'm sure.
Well stated Chris ,but I really don't think this topic has a clear and final answer ,.."efficiently" may depend purely on the individual and his tank and what he or she is looking for,...for me and my tank,..I tried a couple of different units and although some seemingly did a nice job ,to me they were lacking in something making them less "efficient" in my book . I actually opted for a monster recirculating old school unit that requires two pumps to run,...one to feed it water and a giant pump to recirculate that water,..."efficient" ?? Power wise no,... Peace of mind wise and "efficiently" wise removing the gunk ? absolutely yes .,so to me ,this setup was my most "efficient" way go.
I would have to agree with most folks here that no matter how you look at it,it's a compromise,...too many variables to consider , design wise ,power wise etc,...BUT, if put in a corner and had to chose, I would prob go with the two smaller units ,..as greg said, we're talking pennies here,.redundancy can be a nice thing to have ,..peace of mind ,.making it more " efficient",.. ask any airline pilot.