Installs in seconds -No messy assembly -Traps more waste and dirt particles -Makes water crystal clear and clean Pre-assembled TechnoFlo Cartridges provide superior mechanical and chemical filtration, screening out dirt as they remove discoloration, odor-causing waste, and harmful contaminants. Each disposable cartridge is packed with activated carbon, the highest grade there is. Just shake, rinse, and install. For best results, rinse weekly and change monthly. Info from aquarium Life Support systems