Green Diamond Stonewool was created by a small group of hydroponic growers who were passionate about maximizing the capabilities of rockwool. We offers a variety of grow block sizes, slabs and loose stonewool. Stonewool is a preferred medium for its characteristics of water retention, aeration properties (for healthy roots) and a sterile environment (reducing risk of pests and disease). Our products have less packaging and more stonewool for an added value.