Check the listing for details. FLUVAL CLEARX MEDIA INSERT - 4 PACK - CONTROLS PHOSPHATE, NITRITE AND NITRATE. Condition: New. Listed at 8.99 USD. FLUVAL CLEARX MEDIA INSERT - 4 PACK - CONTROLS PHOSPHATE, NITRITE AND NITRATE Fluval ClearX is a chemical filter media that is designed to improve the water conditions in aquariums, creating a clean and healthy living environment for fish. It is specifically formulated to trap and control phosphate, nitrite, and nitrate, which are common contaminants in aquarium water. One of the key benefits of Fluval ClearX is that it helps to maintain cleaner surfaces in the aquarium, which reduces overall maintenance requirements. By removing contaminants and impurities from the water, ClearX helps to eliminate cloudy water, odors, and discolorations, resulting in a clear and visually appealing aquarium. ClearX is suitable for use with all types of filtration systems, including internal and external filters. It is designed to be easily dropped into the clip-ons of these filters, making it convenient to use. To achieve the best results, it is recommended to change the ClearX pad every two weeks. Each pad in the 3+1 bonus pack format is capable of treating aquariums up to 15 US gallons (60 liters) in size. It is important to note that while ClearX can help improve water conditions, regular water changes and cleaning routines are still necessary for maintaining a healthy aquarium. ClearX should be used in conjunction with these regular maintenance practices for optimal results.