Keep the water clean: Water filters remove odors and odors from the water, keeping it fresh, ensuring consistently high water quality, creating a healthy, thriving aquarium that keeps your fish healthy at all times. < p>High quality material: The aquarium filter plate is made of high-quality filter cotton and activated carbon, which has good water absorption, good air permeability, strong cotton texture, soft touch, safe and easy to use. durable. Reusable: The aquarium filter pad is easy to clean, you can use the fish and rock aquarium filter again and again, and it is also easy to install without any tools. Easy to Replace: The filter cartridge is easy to use, just rinse it with cold water, remove the toner and insert it into the filter slot to replace it in seconds. Application: The size is 135 x 56mm, 4 pieces in total, please replace the filter element as needed every 2-4 weeks. Suitable for saltwater tanks, freshwater tanks and aquariums, etc., providing clean and clear water. Note: The data are all manually measured, please allow an error of 1 3 cm due to differences in light and display, there may be color differences, please refer to the actual item received.