https://patents.google.com/patent/US7829130B2/en https://patents.google.com/patent/US7829130B2/en via https://www.reddit.com/r/chemistry/comments/1claif5/gettin

https://patents.google.com/patent/US7829130B2/en https://patents.google.com/patent/US7829130B2/en via https://www.reddit.com/r/chemistry/comments/1claif5/getting_rid_of_sugar_from_milk/ https://www.reddit.com/r/chemistry/comments/1claif5/getting_... From my understanding they take advantage of lactose being smaller than milk and they just get the milk "stuck" in the filter and then throw out the unfiltered lactose.