Dual Gradient Density or also known as DGD water filters cartridges are a type of filter cartridge specifically designed to improve the efficiency and longevity of water filtration and filter systems. these cartridges utilize a dual gradient density structure, which means that the filter medias density changes across the length of the cartridge, which offers enhanced particle capturing capabilities from larger pore sizes on the outer layer to a smaller finer pore size on the inner layer. This is turn extends the life span of the filter and other filters to follow, capturing a wide range of particle sizes effectively trapping them in the outer layer and inner layer, allowing for a more thorough and consistent performance in filtration without disrupting the flow rate. Having a wide range of uses in many different settings, and various micron ratings makes it a great pre filter for a point of use or point of entry system.