Re-bottled Botanicare Hydroguard 4 Ounces (Oz) Lowest dilution rates of any competing product at only 2 ml per gallon. Nutrients and other beneficial organisms will not become depleted or imbalanced due to an excessively diverse population of bacteria species. The Bacillus Amyloliquefaciens in Hydroguard live in bigger, more vigorous colonies than the more common Bacillus Subtillis species. This enables them to thrive and perform more effectively in extreme and unfavorable conditions. No excess gassing or foul odors common with other beneficial bacteria products. Hydroguard runs clean and does not produce slimy biofilms or cause pH fluctuations.