Windermere Humic Aqueous Model, version 7

The Windermere Humic Aqueous Model (WHAM7) is an equilibrium speciation model for waters. It supersedes the previous version of WHAM (WHAM6). WHAM7 is free to existing users of WHAM6 (For new users, please see a summary of pricing at the bottom of this page). WHAM7 comprises a set of submodels for ion binding to humic and fulvic acids, to oxides of iron, aluminium, manganese and silicon, and to clay, as well as a solution speciation model.

WHAM7 offers a number of improvements over WHAM6, including:

  • Humic Ion Binding Model VII. A development of Model VI, Model VII contains an expanded database for cation binding to humic and fulvic acids, including all the rare earth elements and silver.
  • The capability to calculate the effect of uncertainty in input variables and model parameters on model outputs.
  • Simulation of the precipitation of iron(III) and aluminium hydroxides, and binding of ions to precipitates.
  • Input variables can be specified in a number of different units.
  • An unknown concentration of any solute can be calculated by charge balance.
  • The Database Editor is integrated into the main program.
  • Sets of multiple input files can be automatically run.

An introduction to WHAM7 is available. Any questions on the technical capabilities of the model can be sent to Steve Lofts (

Calibration data for Humic Ion-Binding Model VII

The proton- and metal-binding data used to calibrate Humic-Ion Binding Model VII may be downloaded (ZIP format).

Buying WHAM7

Because we do not receive sufficient funding to cover the entire cost of developing and writing our software, we must charge for WHAM.  The proceeds of program sales will be used to cover the costs of technical support and development of future versions of the software.

Purchasers can buy one of two licence types for WHAM:

A SINGLE USER LICENCE allows the use of a single copy on a single PC.

A GROUP LICENCE allows use on a specified number of PCs. When ordering you specify how many PCs you want to be licensed for.

Extra users may be added to licences later, either to change a single user licence to a group licence or to expand an existing group licence.

Potential users from developing countries may contact us regarding special pricing.

Using WHAM for educational purposes

To make it easy and convenient for WHAM to be used for educational purposes, all licences (both single and group) allow you, if you are a member of staff of a bona fide educational institution, for the purposes of course teaching, to install WHAM on one PC per student, for the purposes of course teaching only.


WHAM licences cost as follows. All prices are in pounds sterling.

Single user licence:




Group licence for number of users:










6 or more

£150 per extra user

These prices include carriage but exclude UK sales tax (VAT) of 20%.  VAT is payable if you are based in the United Kingdom or the EU and are not VAT exempt.

You will be asked to provide your VAT Registration Number if applicable.

To order WHAM7: you may either contact us to receive an order form by email or post, or you may fill in the online order form.