The HopRocket is truly an innovative, one of a kind, hop infusing tool that is packed with awesome features. First, it can be used as a hop back on brew day, which helps keep volatile hop aroma compounds in solution after the boil. It also doubles as an in-line hop infuser (aka Randalizer) for your beer dispensing system by adding fresh hop aroma as you poor your finished home brew. Oh and one more thing, it triples as in-line filter. (If using as a filter, a pre-filter should be used in the brew pot as excessive material entering the hop rocket can cause it to plug.) Intended for use with whole hops only!