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When to Replace the Sediment or Sediment/Carbon Prefilter Cartridge(s) • Every six months to one year, based upon your dealer's recommendation and knowledge of the local water conditions. • A noticeable decrease in water production is an indication that the prefilter requires changing. • Generally, private wells require more frequent sediment prefilter changes while softened feed water usually requires only yearly replacement. • Recommended maximum sediment or sediment/carbon prefilter service l