This additive should be used in situations in which the amount of calcium present in the water is below the recommended values. Our Calcium is chelated by EDTA - This product is very stable and does not interact with other elements.. Our chelated Calcium prevents and corrects deficiencies which are caused due to a lack of/or imbalance in the assimilation of Calcium. Maximum Solubility: 2.5lb/gal or 300g/L water Recommended amount for stock solution: 12oz/gal or 90g/L water if you use R/O water, it is necessary to supplement with calcium. *Please check your R/O system regularly (maintainance) INDICATION FOR THE USE OF CALCIUM R/O and very soft > Recommended Values Soft > 50-80% of recommended values Moderately Hard > 10-50% of recommended values Hard Water > No Calcium required The life cycle of a plant can be divided in two main stages, the vegetative growth period and the flowering period. Both stages can be subclassified into different stages with different needs. VEGETATIVE GROWTH PHASE: 1.) Seedling stage (< 15cm) 2.) Young plant & rooted cuttings (15-25cm) 3.) Maturing plant (25-35cm) 4.) Mature plant (>35cm) FLOWERING PHASE: 1.) Pre-flowering / Transition to flowering (week 1-3) 2.) Flower formation and growth (week 3-6) 3.) Ripening of flowers (week 7+)