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I actually found the units with the pump inside better just due to the amount of room it saves. I can get a much larger skimmer in my sump with the pump being internal. You are correct though, it does hold more water if the pump is outside but whether it holds so much more to make it more effective I don't know.Best advice I can give is choose one with the pump outside of the Skimmer body they have a better contact time and hold larger volume of water as pump is outside of unit.
Best advice I can give is choose one with the pump outside of the Skimmer body they have a better contact time and hold larger volume of water as pump is outside of unit.

