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Prime is a premium microbial feed and sweetener engineered to enhance tastes, colors, flavors, and essential oil production. Prime contains silicate, kelps, molasses, humic acids, organic acids* for pH buffering, and much more! Heavy 16 prefers to avoid continuous churning and bubbling of Heavy 16 reservoirs to preserve the fine organic acids that, if over-stimulated, will volatilize quickly and lead to a rapid pH rise when holding a reservoir for more than a few days.