The HopBlocker is a very simple to operate mechanism that keeps hops in your brew pot and not in your fermenter. The basic process that makes the HopBlocker so effective is leaving the fine break material undisturbed at the bottom of the pot while draining the majority of the wort through the coarse filter first. When the wort level is a few inches from the bottom of the pot, the fine filter element is then exposed by lifting the shield and only has to filter the remaining wort. If used properly the HopBlocker will filter 90-95% of the break material and hops out of your wort without plugging.