The SCLX2-4 is a 4.5” x 20” Drop-In cartridge that utilizes ScaleX2®, a chemical-free scale inhibition technology that utilizes Template-Induced Crystallization to effectively inhibit the formation of calcium-carbonate scale. This cartridge is ideal for applications requiring up to 4.0 gpm flow. In most cases, the cartridge will perform for one-year between filter changes.