The end product should be lightweight foam which you will use for your beverage. The foam can make more cups of beverages than normal milk. If you get big bubbles, then something went wrong somewhere. Keep trying every day; make yourself a cup of your favorite drink until you get it right. If your foam maker cannot work for the first few days of buying, be sure to contact your distributor from where you bought it. It is good to buy from a trusted distributor in case it cannot work you will have return policy guaranteed.