Tools

Industry-standard calculators.
Real formulas. Real results.

Find the right calculator for the questions our specialists field weekly — pipe sizing, storage capacity, electrical conversions and water-quality checks. Sensible defaults, every field editable, every output in the units you work in.

S&DSI — Stiff & Davis Stability Index

High-TDS companion to LSI. Use for RO reject, seawater and brackish water above roughly 10,000 mg/L TDS, where LSI loses accuracy.

Ionic strength I
0.375mol/L
K(I,T)
2.29
Saturation pH (pHs)
6.69
S&DSI · Scale-forming
+1.11
Tendency to scale on RO membranes and heat surfaces. Antiscalant advised.

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