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For Arsenic, In areas with high natural concentrations, arsenic causes arsenic poisoning, as well as having been identified as a contributing factor for different forms of cancer. The identification of this problem has precipitatedthe lowering of MCL levels in much of the world from 50 ppb (parts per billion)to 5 ppb or less. For Fluoride, is generally felt to be beneficial for dental health at levels upto 1.5 ppm (parts per million). However, at higher levels it has been linked to fluorosis, causing debilitating bone structure disease, as well as discoloration and mottling of teeth. Fluoride at harmful levels occurs naturally in many of the same regions as arsenic in ground water. Caware's Fluoride/Arsenic removal Blend Carbon block is developed with NSF certificated medias into Block for higher uptake capacity and the ability toremove arsenic cost-effectively without regeneration or creating hazardous waste requiring special handling.