Reduces lindane, atrazine, lead, mercury, greater than 99.95% cryptosporidium and giardia cysts, asbestos, chlorine, sediment, bad taste and odor. 0.5 micron nominal filtration. CBC activated carbon block construction with lead-reduction media. Provides 6 months or 600 gallons of refreshing drinking water. Use with model No. US-600, US-550, and CTR-210 filters.