Dear Tony, thanks for not deleting my thread, frankly, this is kind of ads, but i think if members here who are in need of these liquid filter bags, i will be of help to them. As for the minimum purchasing quantity, that depends on the products that they are going to purchasing, for example, if they order 1micro liquid filter bag, and coincidentally, we have the ready stock, then, there is no limit to the purchasing quantity, two pieces are even ok to us. pls be informed and thanks for your reply.