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Cal-Mag Hydroponic Nutrients Fertiliser

$29.90 – $46.70

High-strength CAL-MAG for fast-growing, heavy-feeding plants.

✅ Chelated Calcium & Magnesium for rapid absorption
✅ Helps prevent blossom end rot, tip burn & stunted growth
✅ Double the strength of standard Cal-Mag formulas
✅ Used by commercial hydroponic growers

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Description

CAL – MAG

NPK 4-0-0

Our Complete Grow CAL-MAG is made from a special blend of chelates and mineral nutrients for effective and fast absorption by plants.

Analysis

🧪 Calcium – 6%
🧪 Magnesium – 2%
🧪 Iron EDTA – 0.1%
🌿 Plus all trace minerals

Complete Grow Cal-Mag is a concentrated Chelated Calcium and Magnesium solution which improves the overall health of the plants. It assists fast-growing and heavy-feeding plants to uptake the required nutrients. It also helps prevent blossom end rot, tip burn, poor setting, and stunted growth.

Double the strength of other Cal-Mag products. Made and used by commercial hydroponic farmers using high-grade chelated fertiliser.

Direction

Apply 0.5 to 1ml per litre of water. Can be used in both grow and flower stages.

Cal-Mag Hydroponic Nutrients Fertiliser

Double-strength Cal-Mag fertiliser made with chelated Calcium, Magnesium, and Iron for fast-growing plants. Prevents common deficiencies like blossom end rot and tip burn. Ideal for hydroponics or soil. NPK 4‑0‑0. Trusted by commercial growers. Free shipping Australia-wide.

High-strength Cal-Mag formula for fast-growing plants
✅ Chelated Calcium & Magnesium for rapid absorption
✅ Prevents blossom end rot, tip burn & stunted growth
✅ Twice the strength of standard Cal-Mag formulas
✅ Suitable for hydroponics & soil-based systems
✅ Made in Australia – trusted by commercial growers

NPK Ratio — Cal-Mag (Hydroponic)

N

4
P

0
K

0
Ca

6%
Mg

2%
Fe

0.1%

What Cal-Mag (NPK 4-0-0) Means

Chelated Calcium and Magnesium to strengthen new growth, deepen green colour and stabilise nutrient uptake in hydro, coco and soil. Double strength for fast correction and steady support.

Stronger structure: Calcium reinforces cell walls and root tips for firm, resilient growth.
Greener leaves: Magnesium drives chlorophyll production for rich colour and efficient photosynthesis.
Prevents issues: Helps avoid blossom-end rot, tip burn, poor setting and stalled growth in fast-growing, heavy-feeding plants.

Cal-Mag supplies essential Calcium and Magnesium in forms plants can absorb quickly. Calcium supports strong meristems, roots and overall firmness, while Magnesium sits at the core of chlorophyll to power energy capture. Use whenever water is soft/RO, media is coco-based, light intensity is high, or feeds are heavy in potassium or ammonium which can compete with Ca/Mg.

Add to water first, mix well, then add base nutrients and any boosters.
Hydro/coco: use a steady low dose each feed; soil: light, regular doses during active growth.
Look for pale older leaves (Mg) or brittle tips/poor fruit set (Ca) as signs to maintain Cal-Mag support.

Prevents Blossom End Rot & Tip Burn

Supports Strong Growth & Nutrient Uptake

Mix 0.5–1ml per litre of water

Feed Your Plants

Watch Them Thrive

Noticed healthier growth within a week. I use it in all my garden bed soils. very fast shipping have also used there all purpose liquid fertilizer combined with this have been seen great results

Ben R

Verified Buyer

This is a great fertiliser, have used for 2 weeks now and can see very good growth taking place .Will definitely get this again. I have very poor dirt where i live so this has helped my plants alot

Chloe M

Verified Buyer

What does Cal-Mag do for plants?

It supports cell strength, prevents deficiencies like blossom end rot or tip burn, and improves nutrient uptake in fast-growing crops.

How is this different from other Cal-Mag products?

This formula is double strength and uses chelated minerals for faster, more effective absorption. You need less to see better results.

Is it safe for hydroponics?

Yes – it’s made for commercial hydroponics and works great in any system: NFT, DWC, coco, soil or drip setups.

Can I use it during flowering?

Absolutely. It’s designed to be used in both veg and flower stages to support calcium and magnesium needs throughout the plant’s life cycle.

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