New
Arrivals/Restock
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
4.3 (30 items)
Limited Time SaleUntil the end
11
07
30
US$34.79 cheaper than the new price!!
Free shipping for purchases over $99 ( Details )
Free cash-on-delivery fees for purchases over $99
Free cash-on-delivery fees for purchases over $99
See all stores
Please note that the sales price and tax displayed may differ between online and in-store. Also, the product may be out of stock in-store.
Used US$23.20
Product details
| Management number | 216129105 | Release Date | 2026/04/19 | List Price | US$23.20 | Model Number | 216129105 | ||
|---|---|---|---|---|---|---|---|---|---|
| Category | |||||||||
- FOUNDATION OF COMPLETE HYDROPONIC NUTRITION: Cal-Mag Plus delivers 3.2% calcium, 1.2% magnesium, and chelated iron - the essential secondary nutrients that base fertilizers lack. Part of our 4-part system designed for DWC, NFT, ebb and flow, drip systems, and coco coir growing. Always add first before other nutrients.
- CRITICAL 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 crystal-clear reservoir solution. No clogged drip lines, no pump damage, no sediment buildup. Creates stable stock solution (2.5 lb per gallon) with 6+ month shelf life. 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 shelf life 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.
- LED GROWS MAY NEED MORE CAL-MAG: High-intensity LED lighting increases transpiration rates, pulling more calcium through plants faster. Many growers report slightly higher Cal-Mag rates under LEDs compared to HPS. Monitor for tip burn and adjust accordingly - prevention is easier than correction.
- HEAVY METAL TESTED FOR FOOD-SAFE GROWING: Every batch is laboratory tested to verify freedom from heavy metal contamination. CDFA registered and manufactured in California, USA since 1989. When growing consumable crops, purity matters - trust a company with 35+ years serving serious growers.
- WHO THIS IS NOT FOR: This is a concentrated supplement requiring mixing, measuring, and EC monitoring - not a complete standalone fertilizer. If you have hard tap water (EC above 0.5), you may not need additional Cal-Mag. Not recommended for soil growing or gardeners wanting pre-mixed solutions. Test your water first.
| UPC | 701748874273 |
|---|---|
| Coverage | 5 |
| Item Form | Powder |
| Brand Name | Greenway Biotech, Inc. |
| Unit Count | 80.0 Ounce |
| Item Weight | 5 Pounds |
| Manufacturer | Greenway Biotech, Inc. |
| Model Number | TRTAZ11A |
| Liquid Volume | 7.57 Liters |
| Target Species | plants, tomatoes, peppers |
| Specific Uses For Product | Hydroponic,Hydroponics |
Bestseller ranking
String Mops
Customers who viewed this product also viewed
Lawn Paint
Correction of product information
If you notice any omissions or errors in the product information on this page, please use the correction request form below.
Correction Request Form