This board is tested and working, but has a shadow permanently on the LCD screen. it can still be read though. The Clack WS1 Control Board V3108CC-05 is a 5 button water filtration part designed for use with the WS1 model. This control board offers a reliable filtration method through its function as a control valve part. The Clack brand is known for its quality and durability in the realm of water filtration systems, making this product a crucial component for maintaining clean and filtered water in your home or garden.