1. High hardness, anti abrasion 2. Stable property, not soluble in acid and alkali. 3. Good adsorbability, ... pressure resistance, resistance to pressure of 23.4kgf, stable chemical property, do not dissolve in acid and alkali , excellent absorption ... material to replace quartz sand filter, improve water quality, greatly reduce the cost. . Test article Test resultTest articleTest resultdeoiling90-95% ...