Manganese in Water Linked to Children's Health Concerns
According to the March 3 Time Magazine, children's drinking manganese in water has been linked to lower math scores, hyperactivity, impaired motor skills and some drops in intellectual function. Although the article doesn't specify levels for concern, we suspect it is at higher levels that there is reason for concern..
This article from Environmental Health Perspectives provides more information.
Kdf, the prime filter material used in most of the whole house and kitchen filters we sell, does filter manganese very well.