Inert gas prevents oxidation by blanketing the surface of the oil and displacing the oxygen, unlike vacuum systems. It is completely safe and will not affect the flavour of olive oil. It is a great way to protect your olive oil in your fusti or any other container.
Private Preserve is the original inert gas, and has been used by wine and olive oil lovers worldwide since 1986.
Net Content 0.34 oz. (9.7g), which is enough for 120 full uses on 750ml bottles (wine bottle size) or roughly 20 fillings of your say 15 litre s/s fusti.