In a dishwasher, the design and water distribution system are specifically engineered to ensure that water reaches all areas, including the top rack, even when the bottom rack is loaded with dishes. Here's how it works:
Spray arms: Dishwashers are equipped with spray arms, which are rotating nozzles located at the bottom and top of the dishwasher. These spray arms are responsible for spraying water throughout the dishwasher during the wash cycle.
Water distribution: The dishwasher's pump circulates water from the bottom of the dishwasher and up through the spray arms. The water is pressurized, allowing it to reach all areas of the dishwasher, including the top rack.
Spray patterns: The spray arms are designed to emit water in specific patterns, ensuring that water reaches both the upper and lower racks efficiently. The spray arm on the bottom covers the dishes in the bottom rack, while the upper spray arm covers the dishes in the top rack.
Redirecting water: The dishes in the bottom rack act as a platform that redirects some of the water upwards, aiding in reaching the top rack. The water bounces off the bottom dishes and rises to the top, ensuring adequate coverage of the dishes on the upper rack.
Filter and drainage: As water circulates, it passes through a filter to remove food particles and debris. This process helps keep the water clean and prevents clogs that could hinder water flow to the upper rack.
While it's true that the dishes in the bottom rack may somewhat obstruct the direct flow of water to the top rack, the dishwasher's design and the spray arm patterns are optimized to overcome this obstacle. As a result, both the top and bottom racks receive sufficient water and detergent to ensure effective cleaning.
However, it's still essential to load the dishwasher properly to maximize cleaning efficiency. Avoid blocking the spray arm's rotation by placing large items or utensils in a way that hinders their movement. Also, ensure that the dishwasher isn't overloaded, as this can impact water distribution and cleaning performance for both the top and bottom racks.