Product Details Base Dual-Stage Base Nutrient APTUS BASE is a dual-stage base nutrient designed for high-demand cultivars in both veg and flower. BASE provides the essential macro and micro elements needed for plant growth throughout the vegetative and flowering phases of growth. The ingredients for BASE were intentionally chosen to not include ingredients which cause unnecessary contamination of the growing substrate. Without these ingredients, BASE allows you to feed accurately knowing the true nutrient density of your feeding solution. BASE contains no added calcium and must be used with either MASSBOOST or MINERAL-CALMAG. DOSAGE INSTRUCTIONS Regular Feeding 4 - 10 ml per 1 gallon METRIC Regular Feeding - 1-2 ml per 1L