The BH-1000 and 2000 is a unique design HOB skimmer in that the pump is mounted external and under the actual skimmer body. By placing the pump outside the skimmer and the aquarium there is no heat exchanged to the water. This design also allows for easy removal of the pump for cleaning and maintenance. The Reef Octopusskimmers are powered by the Hailea OTP pumps. They are built with high quality acrylic. The Octopus skimmers uses metric plumbing parts. The pump has an improved venturi design and pinwheel impeller. We developed a new pinwheel impeller that will be coming with our May shipment of HOB skimmers. Below are the test results from the old impeller to the new improved impeller.