Amazon.comConvenient, Ready-to-Use Filter CartridgesMarineland Penguin Power Filter Rite-Size Filter Cartridges are an easy and convenient solution to keeping your aquarium clean. Rite-Size Cartridges feature Black Diamond Premium activated Carbon that works to trap more dirt and remove more impurities. Likewise, these easy-to-use cartridges deliver maximum water to carbon contact. Each Cartridge is color coded by size to make it easy to select the correct cartridge for your Penguin BIO-Wheel Filter. Penguin Power Filters: Easy and Effective FiltrationRite-Size Filter Cartridges fit Penguin Power Filters. These filters provide easy and effective3-stage filtration for a clean and healthy aquatic environment.Stage 1: Mechanical FiltrationAt this stage, the Penguin Rite-Size Filter Cartridge floss screens out dirt and debris and utilizes a patented ribbed back for maximum water to carbon contact.Stage 2: Chemical FiltrationBlack Diamond Premium Activated carbon works to remove odors, discoloration, and impurities.Stage 3: Biological FiltrationThe patented BIO-Wheel eliminates toxic ammonia and nitrite on contact and is designed to grow the beneficial bacteria needed for biological filtration. The BIO-Wheel now features 50% more surface area. Directions/How to Use Thoroughly rinse the Rite-Size Filter Cartridge to remove any excess carbon dust. Install filter with the blue side of the cartridge facing the back of the filter box. For best results, replace monthly. Find the Rite-Size Filter for YouEach Penguin Power Filter comes with one Marineland Rite-Size Filter Cartridge. Take a look below to see which cartridge is correct for your filter and ensure proper maintenance. Rite-Size A Cartridge Rite-Size B Cartridge Rite-Size C Cartridge Fits Penguin 100 and Mini Power Filters Fits Penguin 125, 150 Power Filters Fits Penguin 170, 200, 330, 350 Power Filters Tetra Water CareTetra sets the bar high in water care treatment and maintenance with a four-step, color-coded system. From aquarium start-up and routine maintenance, to trouble shooting solutions and testing, Tetra offers everything you need to keep your aquarium water healthy. Take a look at the chart below to see the full line of Tetra water care treatments and testing supplies. Start-Up New Aquarium? Tetra SafeStart allows you to safely add fish to your tank immediately. Maintenance Use AquaSafe whenever adding water to neutralize chlorine and heavy metals. Use EasyBalance weekly to keep your water chemistry balanced. Solutions High ammonia? Use AmmoniaSafe liquid or tablets. Cloudy water? Clear it up with WaterClarifier Liquid or Tablets. Algae issues? Keep in check with AlgaeControl liquid or No More Algae tablets. Testing Tetra EasyStrips make regular water testing a breeze.Product DescriptionFor more than 40 years, Marineland has been committed to fishkeeping success. By applying biological science, advanced engineering and imagination to fishkeeping, Marineland continues to be the leader in innovative aquatic environments & equipment. Today, that spirit of innovation is alive and well at Marineland. Whatever your passion - fresh or saltwater, big or small - count on Marineland to bring you the most reliable, the most technically advanced, the highest quality aquariums and accessories on the market. At Marineland, we design our filter cartridges to meet the absolute highest standards of water purification, performance, and operational ease. Each pre-assembled cartridge slides easily into place, providing superior mechanical and chemical filtration, and making replacement fast, dry and effortless. The cartridge mechanically filters water through a pad of double thick poly-fiber. Debris and waste particles are trapped, and water is chemically filtered through Marineland's Black Diamond Premium Activated Carbon. Inside the cartridge, a patented ribbed backing ensures even distribution of activated carbon to deliver maximum water-to-carbon contact. The result?