Fig. 1.
Schematic diagram of the ferric sulfate dispenser used in the study (upper) and photograph of a unit in work (lower). Photograph: Aaro Närvänen
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.