| Support Gravel |
| Specification and Grades |
| Rounded quartzite gravel is used as a support media in filters to provide both protection for the floor nozzles and good hydraulic distribution over the whole area of the filter. |
| Characteristics | ||
| Shape | Rounded | |
| Specific Gravity | 2.65 | |
| Bulk Density | 1.60 t/m3 | |
| Hardness | 6 - 7 Moh | |
| Acid Solubility | less than 2.0% | |
| Sulphate Content | less than 0.1gm/litre | |
| Chlorine Ion Content | 0.01% | |
| Analysis | ||
| Silica | 95 - 97% | |
| Aluminum Oxide | 1.35% | |
| Ferrous Oxide | 0.40% | |
| Calcium Oxide | 0.45% | |
| Sodium Oxide | 0.35% | |
| Magnesium Oxide | 0.30% | |
| Potassium Oxide | 0.20% | |
| Titanium Oxide | 0.09% | |
| Standard Sizes | ||
| 3 - 6 mm | ||
| 4 - 8 mm | ||
| 5 - 10 mm | ||
| 10 - 14 mm | ||
| 12 - 20 mm | ||
| 20 - 40 mm | ||
| 40 - 60 mm | ||