Rice husks can remove microcystin toxins from water

An abundant and inexpensive agricultural byproduct, rice husks have been investigated as a water purification solution in the past. This is the first time they have been shown to remove microcystin, the toxin released by harmful algal blooms that are increasingly occurring in the Great Lakes and other freshwater lakes around the world.
Source: EurekaAlert, https://www.eurekalert.org