Grodan Gro-Wool Medium Water Absorbent Granulate Rockwool, 3.5 cu ft RWXA20 | Grodan

Granulated rockwool can be used alone or as an amendment to organic based mixes. For example, the addition of water absorbant granulate to peat mixes at 25-50% volume increases water holding capacity and aeration, improving plant growth and shelf life.