Dyna-Rok II Medium 3 Gallon. Dyna-Rok II is an all-purpose, inert, soil-less growing medium comprised of 90% silica. Offering a high water absorbance (more than 150 %), Dyna-Rok is the perfect solution for very hot/dry climates. In most applications it is mixed with bark or soil in order to improve aeration and capillary action while reducing the risk of root...
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