Potassium permanganate is an expensive treatment.
Therefore, it is important to properly estimate water volume
to achieve both a cost-effective and biologically effective
treatment. Underestimating water volume will result in an
insufficient concentration of chemical, and retreatment
would be necessary. Overestimating water volume can
result in a greater-than-desired concentration of chemical,
and may injure or even kill fish. Pond volume is measured