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CTO function: 1. Inner socket CTO compressed activated carbon rod filter element: The long-life sintered activated carbon rod and the mesh structure with high dirt holding capacity make the filter element have a dual function, and further remove different colors, odors, residual chlorine, colloids, etc. in the water PP cotton function: 1. Inner socket PP cotton filter element: PP cotton filter element is a pretreatment filter for household water purification equipment, which filters the raw water for the first time to filter out sediment, impurities, rust, suspended solids, etc. in the raw water Filter replacement time: 1. Primary PP Cotton Filter Element: 3-4 Months 2. Three-Level CTO Sintered Activated Carbon Filter Element: 4-6 Months