The multigrade filter process is a water treatment technique used to remove suspended solids and turbidity from water sources, making it suitable for various applications, including drinking water supply and industrial processes. This filtration method involves the use of a specially designed filter bed composed of different layers of granular media with varying particle sizes. The larger particles are trapped near the top layers, while smaller particles are captured deeper within the filter bed. As water passes through these layers, it undergoes successive stages of filtration, resulting in a significant reduction in turbidity and suspended solids. Multigrade filters are efficient, cost-effective, and easy to maintain, making them a popular choice for improving water quality in both small-scale and large-scale water treatment systems.