Alchemist Stout MSA - 1 quartIn Store Location: @D16 Alchemist Stout MSA Monosilicic acid (H4SiO4 aka ortho silicic acid), the form found in Stout MSA, is the most bioavailable form of silicon. Stout MSA is immediately available to your plants and is stable over a larger pH range when compared to other silicon sources like potassium or sodium silicates (ex: will not gel under acidic conditions). This allows for more predictable delivery of silicon to your plants' tissues, which