Humas is a natural plant growth ( Humic acid + Fulvic acid ) supplement that helps plants establish vibrant, vigorous root systems. Humas is outstanding for seedlings and cuttings as well as all phases of plant growth. Use Humas with all types of Hydroponic Nutrients also suitable for all types of hydroponic systems. Humas is suitable for plants growing in all kinds of garden soils and potting mixes. Works with all plant foods Usage: For Light Feeding: 1ml per Ltr For Heavy feeding: 2ml Per Ltr Repeat every 15 Days.