DOS Part 1

Hydroponic Research DOS Part 1 is the first component of the DOS two-part base nutrient system from Hydroponic Research, providing the calcium, nitrogen, and trace element compounds for complete plant nutrition when combined with DOS Part 2. The DOS system (named for its two-part 'DOS' — possibly Dual Optimized System) is designed for professional hydroponic cannabis cultivation.

Add separately from DOS Part 2 when building the nutrient solution. Use throughout vegetative and flowering phases. Made by Hydroponic Research.