Protein Skimmer is used widely in saltwater aquariums or fish tanks to remove any organic compounds before they break down into nitrogenous waste and pollute the water. Basically, you can say that this device in the form of aquarium filtration removes organic compounds just before they start to decompose. You can get more information about the benefits of protein skimmers at Marine Depot
Protein skimming works by releasing thousands of microbubbles from mixing water and air, the smaller the bubbles the more effective the protein skimming is. To produce these bubbles, this unit needs a needle wheel, venture pump, counter-current, and air stone.
These microbubbles will attract different wastes and force them to reach the skimmer's chamber. As the bubbles reach the top of the protein skimmer water column, the water begins to drain and create the foam.
Any inorganic molecules that are somehow bound to the organic ones will be exported back to the water. Several types of molecules that are usually removed in the process are fats, fatty acids, metals, and carbohydrates. This removal is wanted by most aquarists. In fact, they usually place the protein skimmer as the first form of aquarium filtration to lessen the burden of the filtration system as a whole.
Having a skimmer as your filtration system is often considered unnecessary. Well, if you just have a small aquarium with just a few fish inside, it's not necessary to use a protein skimmer. You can just use a standard filtration system.
However, if you are serious about maintaining your water quality, it is suggested that you use a protein skimmer. Some even need a super skimmer to keep the water quality at a certain level.