Where did the eating sake lees come from?
For separation of lees and sake almost anything will work. As long as you have a fairly fine mesh/strainer to contain the lees it will work. I use 5 gallon paint strainer bags and weights between two nesting plastic tubs. Holes in the bottom of the bottom tub will allow sake to drain while containing lees inside strainer, while the inner tub contains weight to press on the lees.
BTW, we use the lees to marinade fish- kasusake salmon, for example, and it is great! It can also be used to make pickles.