Filter aids continue to play an important role in the beer brewing process. The majority of commercial products are either diatomite- or perlite based. However, rice hull ash, a by-product from the incineration of rice hulls, has been shown to be an effective filter aid in the filtration of raw sugar liquors. A research team from the Cuban Research Institute of Sugar Cane Derivatives (ICIDCA) has gone on to investigate its ability to clarify beer The findings of their study are presented below.