Calculator Home / Copy of Calculator Step 1: Select your growing method Recirculating System Drain To Waste Please select whether you are growing using a recirculating hydroponics system or a run-to-waste (drain to waste) hydroponics system Step 2: Choose formula aggression: Standard Aggressive We have two methods of feeding; Standard Feeding - make your nutrients go further, Aggressive - for optimum results Step 3: Enter the EC / CF of your tap water EC CF You will need to check the conductivity of your water before you add any nutrient. Enter the number, then select EC or CF Step 4: Enter your tank size Litres Gallons Enter the size of your tank in litres or gallons Step 5: What is your target Veg & Bloom EC? EC EC Enter what you would like your target EC to be during the Growth and Bloom stages of your plants life cycle