Greenway Biotech Cal-Mag Plus 2-0-0 Calcium Magnesium Supplement - 3.2% Calcium 1.2% Magnesium Chelated Iron (EDTA) - Water Soluble for Hydroponics Coco Coir RO Water - Heavy Metal Tested - 5 LB

Essential for Complete Hydroponic Nutrition: Cal-Mag Plus provides 3.2% calcium, 1.2% magnesium, and chelated iron - the vital secondary nutrients that base fertilizers are missing. Part of a 4-part system designed for DWC, NFT, ebb and flow, drip systems, and coco coir growing. Always add first before other nutrients. Crucial for RO Water and Coco Coir: Reverse osmosis and distilled water contain zero minerals - Cal-Mag Plus replaces what's missing. Coco coir naturally binds calcium, creating deficiencies even with tap water. Use every watering in coco at 5-10 ml/gal to prevent lockout and keep plants thriving. Helps Prevent Blossom-End Rot and Deficiency Symptoms: Calcium strengthens cell walls to reduce the risk of blossom-end rot in tomatoes and peppers when used as part of a balanced feeding program. Magnesium supports chlorophyll production to prevent interveinal yellowing. Chelated iron remains available across a wide pH range to support healthy new growth. 100% Water Soluble - Zero Residue: Dissolves completely in seconds for a crystal-clear reservoir solution. No clogged drip lines, no pump damage, no sediment buildup. Creates a stable stock solution (2.5 lb per gallon) with over 6 months of storage stability. Compatible with all dosing and fertigation equipment. Save 50-70% vs Liquid Cal-Mag: Concentrated powder ships nutrients, not water. One 2.5 lb bag makes the same amount as multiple gallons of liquid product at a fraction of the cost. Approximately $0.08 per gallon of working solution. Long storage stability when stored dry - no waste from expired liquids. Works in All Water Culture Systems: Formulated for recirculating (DWC, RDWC, NFT, ebb and flow) and drain-to-waste systems. Adjust rate based on water hardness: full strength for RO/distilled, 50-75% for soft tap, 25% or skip for hard water. Test your starting EC to dial in the perfect amount. Complete 4-Part System Integration: Designed to work with Grow Green (vegetative), Micro Green (trace elements), and Blossom Green (flowering). Always add Cal-Mag first to water, dissolve fully, then add remaining nutrients in order. Prevents calcium precipitation and keeps all nutrients in solution