Cal-Mag Plus 2-0-0 Concentrate – Heavy-Metal-Free Ca-Mg-Fe
- Regular Price
- $ 33.99
- Sale Price
- $ 33.99
- Regular Price
- $ 33.99
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Cal-Mag Plus 2-0-0
Essential foundation of our 4‑part hydroponic system. Premium chelated calcium, magnesium, and iron prevent deficiencies and strengthen plants. Critical for RO water, coco coir, and LED grows. Save 50‑70% vs. liquid Cal‑Mag while getting laboratory‑tested purity.
🏆Since 1989
💧100% Soluble
🧪Lab Tested
📄CDFA Registered
Deficiency Prevention Timeline
Day 1💧Add First
Day 3-5🌱Prevents Lockout
Week 2💪Stronger Stems
Ongoing🛡️No Deficiencies
Perfect For These Applications
RO/Distilled
Full strength needed
Coco Coir
Every watering
Foliar Spray
5 ml/gal quick fix
4-Part System
2.5-10 ml/gal
Common Deficiency Problems? We've Got Solutions
😟 Blossom-end rot?
✅ 3.2% calcium stops it before it starts
😟 Yellow between veins?
✅ 1.2% magnesium restores green fast
😟 Weak stems & tips?
✅ Strengthens cell walls throughout
😟 Using RO water?
✅ Replaces missing minerals perfectly
🎯 Balanced Ca-Mg-Fe
3.2% Ca, 1.2% Mg, plus chelated iron prevents deficiencies in fast-growing crops
💧 Crystal Clear
Dissolves completely in seconds with no residue for all hydroponic systems
💰 50-70% Savings
Concentrated powder ships nutrients, not water—reducing costs and emissions
⚠️ Critical Mixing Instructions
- ALWAYS add Cal‑Mag Plus FIRST to your water before any other nutrients
- Never mix concentrates directly together — prevents precipitation
- Essential for RO/distilled water (0 EC) — contains no minerals
- Coco coir requires Cal‑Mag every watering to prevent lockout
- LED grows may need 25% more due to increased transpiration
Quick Dosage Guide - By Water Type
Select your water type above
FEATURES & QUALITY GUARANTEE
- Precise Formulation: 2% N, 3.2% Ca, 1.2% Mg, 0.1% Fe‑EDTA
- Prevents Deficiencies: Stops blossom‑end rot, tip burn, and interveinal chlorosis
- Heavy Metal Free: Third‑party tested below detection limits
- Coco & RO Optimized: Essential for coco coir and reverse osmosis water
- Nutrient Catalyst: Enhances uptake of other nutrients in the system
- Professional Grade: Used by commercial growers worldwide
- Eco‑Friendly: 90% less shipping weight than liquid products
- Cost‑Effective: Concentrated powder saves money vs. liquid Cal‑Mag
- CDFA Registered: Meets California's strict agricultural standards
- Made in USA: Manufactured in California since 1989
- Indefinite Shelf Life: Powder never expires when kept dry
- 90‑Day Guarantee: Full refund if not completely satisfied
DERIVED FROM
Professional‑Grade Ingredients
Calcium Nitrate
Fast‑acting, fully available calcium source
Fast‑acting, fully available calcium source
Magnesium Nitrate
Highly soluble magnesium for chlorophyll
Highly soluble magnesium for chlorophyll
Iron EDTA
Chelated iron stays available at all pH levels
Chelated iron stays available at all pH levels
No Chlorides
Safe for sensitive crops and recirculating systems
Safe for sensitive crops and recirculating systems
APPLICATION RATES & INSTRUCTIONS
Cal‑Mag Plus is the foundation of our 4‑part system. Always add it FIRST to prevent precipitation.
📦 Stock Solution Preparation
| Package Size | Water Needed | Concentration | Yield |
|---|---|---|---|
| 2.5 lbs | 1 gallon | 2.5 lb/gal | 1 gal concentrate |
| 5 lbs | 2 gallons | 2.5 lb/gal | 2 gal concentrate |
| 10 lbs | 4 gallons | 2.5 lb/gal | 4 gal concentrate |
| 25 lbs | 10 gallons | 2.5 lb/gal | 10 gal concentrate |
💧 Water Type Adjustments
| Water Type | EC Reading | Cal‑Mag Rate | Notes |
|---|---|---|---|
| RO/Distilled | 0.0 | 100% (10 ml/gal) | Always required |
| Soft Tap | 0.1‑0.3 | 75% (7.5 ml/gal) | Monitor monthly |
| Medium Tap | 0.3‑0.5 | 50% (5 ml/gal) | Test water report |
| Hard Tap | >0.5 | 25% or skip | May have enough |
🌱 Complete 4‑Part Feeding Schedule (ml/gallon)
| Growth Stage | Cal‑Mag Plus 2‑0‑0 |
Grow Green 4‑2‑6 |
Micro Green 2‑0‑3 |
Blossom Green 2‑6‑8 |
EC Target |
|---|---|---|---|---|---|
| Seedlings | 2.5 | 1.25 | 1.25 | 1.25 | 0.5‑0.8 |
| Early Veg | 5 | 5 | 5 | 5 | 1.0‑1.4 |
| Late Veg | 7.5 | 15 | 10 | 5 | 1.4‑1.8 |
| Transition | 10 | 10 | 10 | 10 | 1.6‑2.0 |
| Early Bloom | 10 | 5 | 10 | 15 | 1.8‑2.2 |
| Peak Bloom | 10 | 0 | 10 | 20 | 2.0‑2.5 |
| Late/Flush | 5 | 0 | 7.5 | 15 | 1.5‑2.0 |
🔬 Deficiency Prevention Guide
| Symptom | Deficiency | Solution |
|---|---|---|
| Blossom‑end rot | Calcium | Increase to 15 ml/gal |
| Yellow between veins | Magnesium | Foliar spray 5 ml/gal |
| Brown leaf tips | Calcium | Check pH (5.5‑6.5) |
| New growth yellowing | Iron | Lower pH to 5.8 |
Special Considerations
- Coco Coir: Use every watering — coco binds calcium
- LED Grows: Increase 25% due to higher transpiration
- Foliar Spray: 5 ml/gal at dawn/dusk for quick correction
- Hard Water: Test first — may not need Cal‑Mag
CAL‑MAG CALCULATOR
Cal‑Mag Plus 2‑0‑0 Calculator
Calculate precise amounts for any application
Stock Solution Mixer
📋 2.5 lbs of Cal‑Mag Plus makes 1 gallon of concentrate
Hydroponic System
📋 For DWC, NFT, Ebb & Flow, or other hydro systems
Coco Coir Growing
📋 Special calculations for coco media
Foliar Spray
📋 Quick correction for visible deficiencies
Complete 4‑Part System Recipe
📋 Get the complete nutrient mix for your reservoir
Measurement Conversions
1 ml = 0.034 fl oz
5 ml = 1 teaspoon
15 ml = 1 tablespoon
30 ml = 1 fl oz
COMPARE WITH OTHER CAL‑MAG PRODUCTS
| Feature | Cal‑Mag Plus 2‑0‑0 | Liquid Cal‑Mag | CalMag Pro |
|---|---|---|---|
| Form | Dry Powder | Liquid | Liquid |
| Ca‑Mg‑Fe | 3.2‑1.2‑0.1 | 2‑0.5‑0.1 | 3‑1‑0 |
| Shelf Life | Indefinite | 2 years | 3 years |
| Cost per gallon | $0.08 | $0.25 | $0.20 |
| Shipping Weight | 90% less | Heavy | Heavy |
| System Design | 4‑Part Complete | Supplement | Supplement |
COMPLETE YOUR 4‑PART SYSTEM
Cal‑Mag Plus works best as part of our complete hydroponic nutrient system:
- 🌱 Grow Green 4‑2‑6 — Vegetative Growth Formula
- 🌸 Blossom Green 2‑6‑8 — Flowering Formula
- 🔬 Micro Green 2‑0‑3 — Complete Micronutrients
Using all 4 components ensures balanced nutrition from seed to harvest.
FREQUENTLY ASKED QUESTIONS
Why choose powder over liquid Cal‑Mag?
Powder costs 50‑70% less per dose, ships with 90% less weight, never expires when dry, takes less storage space, and allows you to adjust concentration based on your water. You're paying for nutrients, not water!
Do I need Cal‑Mag if using tap water?
Test your water EC. Below 0.3 EC needs Cal‑Mag. RO/distilled always requires it. Hard water (EC >0.5) may have enough, but test to be sure. Get a water report from your utility for calcium/magnesium levels.
Can I use it as a foliar spray?
Yes! Mix 5 ml of stock solution per gallon and spray at dawn/dusk when stomata are open. Great for rapid correction of deficiencies. Avoid hot sun and stop 2 weeks before harvest.
Is it required for coco coir?
Absolutely. Coco binds calcium, creating deficiencies even with tap water. Use Cal‑Mag every watering at 5‑7.5 ml/gal. Pre‑buffer new coco with 10 ml/gal solution before use.
How do I know if my plants need more?
Calcium deficiency: blossom‑end rot, brown spots, tip burn. Magnesium deficiency: yellowing between leaf veins on older leaves. Iron deficiency: yellowing of new growth. Prevention is easier than correction!
HAVE QUESTIONS?