How To Remove Grease and Oil from Natural Stone. T he materials in natural stone countertops may vary marble and granite are common choices. When confronted with an oily stain on a natural stone surface, it may be tempting to use a citrusbased degreaser to try to lift and remove the dark blot.
The longer the wastewater stays in the. trap, the better the separation. But as the amount of retained grease and solids increase, the. effective volume of the trap decreases, retention time decreases and physical separation decreases, resulting in pass through of solids, fats, oils and grease.