Flush systems are mechanisms used in toilets to remove waste and clean the bowl. When the user presses a button or pulls a lever, water from the tank rushes into the bowl, carrying waste through the plumbing system. This process helps maintain hygiene and prevents odors. There are different types of flush systems, including gravity-fed and pressure-assisted models. Gravity-fed systems rely on the weight of water to create a flow, while pressure-assisted systems use air pressure to force water into the bowl more powerfully. Each type has its advantages, such as efficiency and noise levels.