Drip PK-Booster Gallon - Case of 4Highly concentrated Phosphorus and Potassium boosting supplement. Designed to be used throughout the flowering stage of any fruit or flower producing plants. Also contains chelated Manganese and chelated Zinc. Dilution: 1 3 mL (0. 03 0. 10 fl. oz) per 4 L (1 gallon) of water through Weeks 1 8 of any fruit or flower producing plants. Developed as a PK Booster, Flex is rich in highly bio available Phosphorus and Potassium, providing your plants with the