| Initial flow rate (mL/h) | True density (g/cm3) | Porosity (-) | ||
| Before water flow | After water flow | Before water flow | After water flow | |
| 50 | 1.878 | 2.494 | 0.361 | 0.442 |
| 110 | 2.292 | 0.476 | ||
| 320 | 2.152 | 0.519 | ||