We recommend using Rice Hulls in as an aeration amendment. For a NoTill setting use equal parts Rice Hulls and Grow Stones/Pumice/Scoria as the aeration component of your soil mix. Otherwise, Rice Hulls alone can be used for your aeration amendment for a few growing cycles, depending on microbial activity.
Our rice hulls have also been used extremely successfully by both professional and amateur brewers who utilize them for their filtration properties. We get our rice-hulls from a local producer and each bag is approximately 3.5kg in weight however due to the size (volume) needs to be shipped as a 25L item.