Max Water Activated Carbon Block ( CTO ) Filters - 10-20-30 inch x 2.5 inch Start drinking healthy and stop drinking impurities with your Max Water CTO Filtration Cartage. Max Water offers the highest impurity reduction rated systems, sub-systems & parts for up to 99.99% reduction of major water impurities and improves the taste of drinking water and water for your aquarium and fish tanks. We have designed our replacement filter to work for long-lasting high-grade impurity filtration, giving you the cleanest water and the best value in filtration. Choose the best in-home filtration and start drinking healthy today! Size 10-20-30inch x 2.5-inch Fits most slim size housings and most Reverse Osmosis systems.