Hey Tilahun,

I’ve worked on Gibbs diagrams before—great tool for visualizing water chemistry data! While there’s no default Gibbs plot template in Excel, you can build one fairly easily using scatter plots.

You’ll just need:

• TDS values (or EC) on the X-axis (in log scale),
• Percent cations (like Na⁺/(Na⁺+Ca²⁺)) or anions (Cl⁻/(Cl⁻+HCO₃⁻)) on the Y-axis.