| | Name | Type | Identifier | Description | Constraints |
| Input | Mask | Grid (input) | MASK | - | - |
| Gradient | Grid (input) | GRAD | - | - |
| Output | Concentration | Grid (output) | CONC | - | - |
| Options | Inlet Concentration | Floating point | CONC_IN | - | Minimum: 0.000000 Default: 5.000000 |
| Outlet Concentration | Floating point | CONC_OUT | - | Minimum: 0.000000 Default: 3.000000 |
| Concentration Approximation Threshold | Floating point | CONC_E | - | Minimum: 0.000000 Default: 0.001000 |
| Minimum Gradient | Floating point | GRAD_MIN | - | Minimum: 0.000000 Default: 0.000000 |
| Neighbourhood | Choice | NEIGHBOURS | - | Available Choices: [0] Moore (8) [1] Neumann (4) [2] Optimised Default: 0 |