| D0 | Diameter of the inlet | cm |
| Dc | Diameter of the column | cm |
| Di | Diameter of the bed bottom | cm |
| H0 | Static bed height | cm |
| HB | Cone height | cm |
| Hc | Column height | cm |
| mp | Load of inert | kg |
| Pmáx | Peak pressure drop | Pa |
| Q | Maximum feed flow rate of distilled water | mL/min |
| Qsm | Maximum feed flow rate of skimmed milk | mL/min |
| umj | Minimum spouting velocity | m/s |