One of the main selling points of Crossflow is the efficiency of the system and its ability to handle higher turbidities and produce bottle ready wines in a single pass. Wines do not need to be pre-filtered. If wines are un-racked, we normally start filtration off the racking valve, and then complete the filtration from the bottom valve or with a wand. Un-racked wines should be settled to below the racking valves, normally 3 – 4 days after bentonite addition is adequate.
We would typically only do stop fermentations for sweet wines to reduce the amount of sulfur additions, or for stuck fermentations where alcohol needs to be reduced to restart the fermentation.
The Crossflow is not suitable for wine lees, our qualification for whether we can filter the wine or not is whether the wine passes through our prescreen filter.