Photo Distillery is designed to help you with one thing: decide which of your digital images to keep. Basically it lets you look at your images in a size which covers your entire screen and decide which to keep and which to reject.
The files you decide to keep are moved into a folder “keep” created in your image directory.
Since the images you decide to keep are move into the keep folder you can easily run Photo Distillery several times on a smaller and smaller subset of your images. First run it on the images in your image directory, and then run it on the image directory/keep directory then on image directory/keep/keep etc.