Thanks for that. I didn’t know they were stabilized orthosilicic acid. Considering what you wrote, a few things come to mind:
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The product formulation dictates the degree of stability once diluted into a working solution. For example, the formulation I shared is considerably more stable than the most commonly used choline chloride stabilized products (like Power SI, I assume). I would also assume Rexil and Loveland SST are choline chloride stabilized. There are only a few manufacturers in the world who make stabizlied orthosilicic acid. Those mfgs then white label for other companies (contract manufacturing).
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In the cannabis world, many companies provide considerably more a.i. than listed on the label. I’d have Power Si analyzed by Thornton Labs to see if its orthosilicic acid concentration (a.i.) is greater than listed on the label.
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You make an excellent point about non-listed a.i. Normally pesticides (as defined by EPA), commonly called plant growth regulators. I wouldn’t put it past Power Si to include them. However, due to the complexity of silicate chemistry, I would guess they don’t. Testing is critical like you wrote, if you suspect unlisted PGRs.
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Stabilized orthosilicic acid products are common in AG in Europe (Spain comes to mind) and elsewhere. But not in the US. And they are most commonly applied as foliar sprays, not drenches. I would consider Loveland to be AG.
Also, I agree about grow store nutrients (or any nutrients marketed to cannabis). I formulate and mix all my nutrients, supplements, PGRs, and surfactants/adjuvants (except for organosilicate). I’m a plant biologist.