People at risk should boil water for at least one minute or buy a water filter approved by NSF International, a product testing organization.
(People at risk; should boil; water; T:for at least one minute) (People at risk; buy; a water filter approved by NSF International, a product testing organization) (a water filter; approved; by NSF International)
People at risk People at risk a water filter
should boil buy approved
water T:for at least one minute
a water filter approved by NSF International, a product testing organization
by NSF International