Built from top to bottom with high-quality cell cast acrylic, that can withstand the wear and tear of everyday use in saltwater aquariums. The SK-45 utilizes a needle wheel impeller pump that disburses microbubbles to extract harmful toxins and removes phosphates that causes the nuisance of undesirable algae. This sleek and newly designed protein skimmer is simple to set up and operate. Ideal for aquariums up to 45 gallons the SK-45 outperforms and delivers optimal skimming leaving your tank micro bubble-free.