Power SI Granular Silica - 2 kgThe Most Cost Effective Monosilicic Acid On The Market Power Si Granular is the only, first of its kind slow release granular formula containing stabilized silica, and other proprietary ingredients. This combination plays a key role in releasing locked up nutrients from the soil. Power Si Granular provides a stable matrix to keep silica in an active state, which is available to the plants for an extended period (up to 30 days after application). If