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I beg to differ on that, I have personally taken one of those little balls and squeezed it and it burst open and it contained some sort of clear liquid that I am assuming was liquid fertilizer, if it were silica it woul not burst.As a little FYI, the "little balls" in MG Blue Bag are actually silica gel, for water retention. You can't actually see the extended release nutes. You may be tempted to think it is like an "extended release pill" but the nutes are merely "extended release" by virtue of their molecular structure and how they react and release soluble nutes over time.