A filtered olive oil is clear, stable over time, and easy to store. Unfiltered oil appears slightly cloudy or has sediment at the bottom of the bottle. But the difference goes far beyond appearance: it concerns the manufacturing process, the product's shelf life, and how you will use it in cooking. Here's what you need to know to make an informed choice.
Filtration and decantation: two processes not to be confused
Most articles on the subject use the words "filtration" and "decantation" as if they meant the same thing. This is not the case, and the confusion perpetuates misconceptions about oil quality.
Filtration: an active passage through a filter
After cold extraction, the oil still contains microscopic solid particles—pulp fragments, skin residues—and a fraction of vegetable water. Filtration involves passing the oil through filters (cotton, cellulose, or filter plates) to remove these elements. The result is a perfectly clear oil, with a golden or green hue depending on the variety, stable and ready to be bottled immediately after milling. If you're looking for a green fruity organic olive oil with clean and persistent aromas, filtration ensures that these aromas will not be altered by residual fermentation.
Natural decantation: a passive and slow process
Natural decantation, on the other hand, uses no filters. The oil is simply stored in stainless steel tanks, and suspended particles gradually settle at the bottom by gravity. This process lasts between 4 and 10 months, depending on the storage temperature and the olive variety used. Carolea, a Calabrian variety harvested between November and January, is known for producing an oil with a particularly abundant natural deposit due to its high vegetable water content. Once decanted, the oil can be bottled without filtration: it will then be clear but will have waited several months in the tank before reaching you.
What is called "unfiltered oil" on shelves
When a bottle bears the mention "unfiltered," it refers to oil bottled before the end of natural decantation. It still contains suspended particles, hence its cloudy appearance. This is not a defect: it is simply an early stage in the oil's life. To discover both profiles side by side, the 500 ml bottle discovery duo allows you to directly compare green fruity and ripe fruity oils.
What filtration really changes
Preservation: the decisive advantage of filtered oil
The residual vegetable water present in unfiltered oil can, over time, promote a slight fermentation that alters the aromas. This is why unfiltered oil should ideally be consumed within 12 months of bottling and stored away from heat and light. Filtered oil, on the other hand, offers superior stability throughout its minimum shelf life. For daily family use or for a 5-liter container intended to last several weeks, filtration is a tangible asset.
Aromatic profile: subtle differences
Professional tasters agree on one point: the aromatic differences between a filtered and an unfiltered oil from the same batch are minimal if filtration is carried out correctly and quickly after extraction. What matters more is the variety, the harvest date, and the time between picking and milling—ideally less than 24 hours to preserve the aromas. A ripe fruity organic olive oil with notes of ripe tomato and sweet almond will express these characteristics, whether filtered or not, provided the quality of the raw material is present.
Sediment at the bottom of the bottle: should you worry?
Sediment in a bottle of olive oil is not a sign of poor quality. It simply indicates that the oil has not been filtered, or that it has been lightly filtered and decantation continues in the bottle. This sediment is composed of natural olive particles. However, if the oil gives off a rancid or vinegary odor, the problem comes from faulty preservation, not the sediment itself. For professionals who want a regular and stable supply, the professional section allows them to define the formats and profiles adapted to each use in the kitchen.
How to choose between filtered and unfiltered?
Here are the six criteria to compare to make your choice:
- Appearance: filtered oil is clear, golden or green; unfiltered oil is cloudy, veiled.
- Preservation: filtered oil can be kept until the indicated best-before date; unfiltered oil should ideally be consumed within 12 months.
- Aromatic profile: clean and stable for filtered, slightly more rustic upon opening for unfiltered.
- Recommended use: filtered is suitable for cooking and daily finishing; unfiltered is ideal for tasting, bread, and raw vegetables.
- Storage: both should be stored away from light, but unfiltered also needs to be protected from heat.
- Sediment in bottle: absent in filtered, possible in unfiltered.
For daily use
If you use olive oil every day—for cooking, seasoning, finishing a dish—a filtered oil is more practical. It keeps better, its aromatic profile remains stable from the first to the last milliliter, and it does not require special attention. The trio of olive oils in 200 ml format allows you to explore three different profiles without risk of waste.
For tasting and simple dishes
Unfiltered oil, consumed fresh in the first few weeks after harvest, can offer remarkable aromatic intensity on bread, raw vegetables, or carpaccio. It is a seasonal product, to be treated as such: buy it in small quantities, consume it quickly. For establishments wishing to offer a tasting experience to their customers, the personalization page allows them to create bottles with the establishment's identity.
Frequently Asked Questions
Is unfiltered olive oil better quality than filtered?
No, filtration is not an indicator of inferior or superior quality. A filtered extra virgin olive oil and an unfiltered extra virgin olive oil can come from the same batch, with the same free acidity and the same aromatic profile. The difference lies in the finishing process, not in the quality of the raw material.
Can you filter unfiltered oil yourself at home?
Yes, by using a coffee filter or a fine cheesecloth. The result will be a clearer oil, but household filters are not as fine as industrial filters. The operation is useful if the sediment starts to give off an undesirable odor, a sign that the storage has been too long.
How long can you keep unfiltered olive oil after opening?
Once opened, unfiltered oil should ideally be consumed within 4 to 6 weeks. Close the bottle well after each use, store it away from light and sources of heat. Opened filtered oil can be kept for up to 2 months under the same conditions.
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