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RAW Humic Acid contains 59% humic acids derived from leonardite which is the most concentrated, water soluble humic acid product on the market today. In nature, humic acid has a buffering effect on the pH of soils. It can raise the pH of acid soils and lower the pH of alkaline soils. RAW Humic Acid is also great for hydroponics applications, especially when added to RO filtered water. RAW Humic Acid is a natural chelator and is a beneficial supplement to all feeding schedules. Works in conjunction with all nutrient and feeding programs.