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Resistance and Resistivity

Approximate Resistivity of Water

Where:

T is ppm dissolved solids
R is resistance in ohm-cm.

Resistance of a Single Rod Anode to Earth⁽¹⁾

Resistance of Multiple Vertical Anodes to Earth⁽¹⁾

⁽¹⁾Derived from H.B. Dwight Equations
Rough Indications of Electrolyte Corrosivity vs. Resistivity

Ohm – Cm	Corrosivity
Below 100	Extremely corrosive
100 – 1,000	Very corrosive
1,000 – 2,500	Corrosive
2,500 – 7,500	Moderately corrosive
7,500 – 15,000	Mildly corrosive
Over 15,000	Progressively less corrosive

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