Super Reef Octopus Skimmers remove more harmful proteins from your water with a strong combination of Bubble Blaster pumps and innovative features. Bubble Blaster pumps provide strong flow rates with silicone nitride impellers for more bubble production. A bubble plate diffuser sends the bubbles into the collection cup through the cone rising neck for more contact time and easy waste removal. Aclear window tells you when your pump impeller is dirty and further eases maintenance. The impeller is made from silicone nitride which makes it stain resistant to calcium for low maintenance. Gate valves let you control the skimming action with precision.