larger batches of whiskey - straining?

[dunluce]

I'm looking to start making some larger batches of whiskey, possibly 15-20 gallons at a time. The equipment I have is basically buckets and carboys for fermenters, similar to what I assume a lot of people have.

I do have a Brewzilla to use as a mash tun, but how do people do this in a timely manner? Do they just mix it all together, and then siphon it off the top of the grains once it is fermented? Or do they strain it through a filter, gallon by gallon until they have enough to ferment? I'd grab a food grade barrel for this, but then I would have the same question.....how do I separate this in order to distill the finished product? Just siphon off the top?

Has anyone come up with a system to fill a food grade barrel with mash that can then be easily separated from the grains?

Thanks.