Description: Quality MaterialThe filter cartridges are made from filter cotton, plastic and activated carbon, which can provide lasting filtration performance and keep the water clean and fresh for fish. Efficent CleaningThe activated carbon material inside the filter cartridges prevents odors, water discoloration and impurities in the aquarium, providing clean and fresh water for better fish. Strong AdsorptionThe filter cartridges can capture fine particles or dust in the water and remove odors, water discoloration or impurities that may harm the aquarium. They will help maintain the water quality in the aquarium. Regular ReplacePlease replace the filter cartridges regularly to maintain a high level of aquarium filter performance. It is recommended to replace them every 2 to 4 weeks. Rinse the filter before placing it in the tank. Practical GiftIf your family or friends are keeping fish or other aquatic pets that need aquariums or tanks, you can send these filter cartridges to them. Their cleaning work will be done more efficiently. Specification: Material: filter cotton + plastic + activated carbon Model: fit for Aqua-Tech filters with a power of 20 to 40 or 30 to 60, fit for Aqua-Tech EZ-Change #3 aquarium filter Color: blue + black Feature: durable Size(approx.): (length x width x thickness) 20 x 16.5 x 2cm/7.87 x 6.5 x 0.79inch Package Included: 5 Pcs x Filter Cartridges Note: 1.Due to the light and screen difference, the item's color may be slightly different from the pictures. 2.Please allow 1-2 cm differences due to manual measurement.