Coral Life Super Skimmer Needle Wheel Water Pump water proof remote trainer 5) The shock intensity is 5) The shock intensity is adjustable from 0 to 3 to suit for small The plastic film pulls down so you can quickly and easily throw away old litter and prepare a new lining Protein skimmers have become a standard component in saltwater and reef aquarium filtration systems as they are very effective at removing dissolved organic compounds from aquarium water The needle wheel system creates a spiraling vortex of water and micro bubbles inside the reaction chamber where the bubbles attract fine proteins and organic compounds and deposit them in the collection cup