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.

Go To Download

aqion 8.1.5
(released Feb 11, 2023)