Surface acres x average depth in feet
x ppm of chloride to add to the pond x
4.5 = pounds of salt (NaCl) needed to
add to the pond
You need 4.5 pounds of salt to
increase the chloride concentration
by 1 ppm in an acre-foot of
water.
Example
The following readings are
obtained from a 20-acre catfish
pond with an average depth of 4
feet:
4 ppm nitrite
15 ppm chloride