For refining products to be bottled as edible oils ( e.g. sunflower seed oil or corn oil) winterization is required to achieve the necessary cold stability. Winterization prevents crystallization & clouding of the waxes contained in the oil at ambient temperature.

In the winterization process the oil is cooled by heat exchange with cold water to a temperature between approx. 5 & 10 degree C. Crystals causingoil clouding are formed during a mature period of up to 24 hours & are subsequently separated.

This is implemented by continuously adding filtering aids & filtration via horizontal filters.