Nectar for the Gods brings us their pH product.....Olympus Up Not only will you be adjusting the pH levels in your plants, but because Liquid Calcium is the adjusting agent, more calcium will be added to your plants cell structure! Excess Olympus Up left in the soil will serve as a food source for soil biota, increasing aeration and microbial activity! Using Olympus Up and Herculean Harvest together is highly suggested. Feeding Schedule Early Vegetative: 6.0-6.2 Mid Vegetative: 6.0-6.2 Late Vegetative: 6.0-6.2 Early Flowering: 6.2-6.8 Mid Flowering: 6.2-6.8 Late Fruiting: 6.2-6.8 Flush: 6.4