Hydrochemistry & Water Analysis
aqion is a free hydrochemistry software that
- validates aqueous solutions: charge balance, EC, …
- calculates pH (acid-base reactions, addition of chemicals) — Online Demo
- calculates the calcite-carbonate system (closed/open CO2 system, LSI)
- calculates alkalinity, buffer capacities (ANC, BNC), and water hardness
- calculates equilibria with mineral phases (dissolution, precipitation, SI)
- calculates and plots titration curves
- calculates redox reactions
aqion uses the well-known U.S.G.S. software PhreeqC as an internal numerical solver.
aqion is free for all (private users, education, companies, …). In addition, there is the extended version aqion PRO. Both programs run on Windows.
aqion
8.6.9
(released Jun 11, 2025)
(released Jun 11, 2025)