Acurel Pollutant Reducing Pads are infused with carbon media and help pull harmful pollutants from your aquarium or pond. Use these pads to improve and maintain healthy fish, improve water quality, reduce water discoloration, eliminate odors and remove all organic particles, foreign debris, residual medications, and excess food and waste. Made with long-lasting polyfiber material Twice as thick and more rigid than other pads Fit tighter, hold their shape longer, filter more effective and last longer Dimensions: 10"L x 18"W