Unfiltered oil will contain small particles of olive flesh. While some claim this adds additional flavor, it often causes sediment to form at the bottom of the bottle. There are varying degrees of filtration (partially filtered, lightly filtered, etc), but this sediment may become rancid. This will over time deteriorate the oil’s flavor and shelf life. Unfiltered oil should be properly stored and used within 6 months of bottling. We recommend that unfiltered oils are best enjoyed drizzled over salads or grilled vegetables, and not for cooking.