Changes

Free chlorine does the hard work of killing bacteria and oxidizing contaminants. When you add chlorine to water, you are actually adding free chlorine. When the free chlorine combines with contaminants, it becomes combined chlorine, or chloramines. In water, this form of chlorine has very little sanitizing ability, and no oxidizing ability. Total chlorine is just the sum of both combined chlorine and free chlorine.

[[File:free chlorine chart.jpg]]

==Reference manuals, videos, and links==

*[http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CEoQFjAA&url=http%3A%2F%2Fwww.cdc.gov%2Fsafewater%2Fpublications_pages%2Fchlorineresidual.pdf&ei=NPS7T_CFB4SIiAKa8YXZDQ&usg=AFQjCNH--Yv-fW48hdJn4hOiyHCIy8bh_w&sig2=_1kmqCPh312qW3BNYAL0gw Chlorine Residual Testing Fact Sheet.] CDC SWS Project.