HD-H(ard)D(irty) is meticulously crafted using a blend of components derived from our TAP/HARD and DIRTY formulas. Ideal for rock wool, grow stones, and other inert hydroponic media, it offers the potential for superior quality results. However, it requires more careful handling compared to other formulas. pH levels have a tendency to fluctuate and must be closely monitored within both the reservoir and root zone. Optimal results are achieved with smaller container sizes, facilitating more frequent irrigation to maintain pH within the desired range. Designed for use with soft water (0 EC – 0.4 EC), it is recommended to combine with +LIFE and Shine for peak performance. Please note: As a product containing natural ingredients, it may contain undissolved sediment and biofilm. For a fully soluble alternative, consider exploring RO/SOFT and TAP/HARD.