I’m not sure we can do that. Even if we could, drilling millions of holes is a lot of work. Also, for membranes, it’s not only the size and shape of the ‘holes

I’m not sure we can do that. Even if we could, drilling millions of holes is a lot of work. Also, for membranes, it’s not only the size and shape of the ‘holes’ that count. Many have specific chemical properties that do not solely filter on particle size.