Line 30:
Line 30:
| Stackable || Yes || No || Yes || Yes
| Stackable || Yes || No || Yes || Yes
|-
|-
−
| Porosity || 60-65% || 75-85% || 50-65% || 95%
+
| Effective Porosity (n') || 60-65% || 75-85% || 50-65% || 95%
|-
|-
| Maintenance access || Moderate || Excellent || Moderate || Difficult
| Maintenance access || Moderate || Excellent || Moderate || Difficult