And I needed a test bed. One is set up as a worm composter and the other a bsf one. It took 2 weeks and 2000 worms to get it up to speed but it seems like it could handle a quart a day. The biggest issue I haven't faced yet is emptying it and collecting back the worms. Highly recommended for a 4 x 4 or larger layout, but takes up too much space for 2 x 4.