Athena Nutrients Blended Line - CaMg — Professional-Grade Calcium Magnesium Supplement
Best for: Growers using RO water, inert media, or high-performance systems who need clean, clogging-free calcium and magnesium supplementation
Our thoughts
This is a proper professional-grade cal-mag that doesn't muck about. Fully soluble, no sediment, works seamlessly with the Athena Blended Line, and designed for growers who run automated systems or want precision nutrient control. One we recommend for serious indoor growers who need reliability without compromise.
Athena CaMg is a liquid calcium and magnesium supplement formulated to address deficiencies and support peak performance in demanding growing conditions. Designed as part of the Athena Blended Line system, it works alongside Grow A&B or Bloom A&B to provide flexible, variable EC feeding — giving you precise control over nutrient ratios when crops need an extra boost. Unlike conventional cal-mag products, this is 100% soluble with zero sediment, making it ideal for automated irrigation systems where clogging isn't an option.
How it compares
Athena CaMg sits at the professional end of the calcium magnesium market.
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Fully soluble formula — won't clog venturis, dosers, or peristaltic pumps in Dosatron, Netaflex, or similar fertigation systems
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Modular design — separates cal-mag from your base feed, allowing variable EC feeding and true fertiliser precision
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Clean delivery — no organic material or sediment, just what you need with zero system risk
- Higher cost than budget brands, but engineered for commercial-grade consistency and automation compatibility
In practical terms: if you're running an automated system, growing in coco or rockwool with RO water, or need the flexibility to push calcium and magnesium independently from your base nutrients, this is the right choice. Budget alternatives may work, but they don't offer the same system security or nutrient precision.
Usage guidance
Athena CaMg is designed to supplement your base Athena feed at any stage of the growing cycle.
Standard dosing (all media types)
Add 0.5–0.8 mL per litre of water during all growth phases, or 2–10 mL per gallon as needed. Start at the lower end and adjust based on visual plant response and EC readings.
RO water systems
Essential in RO setups where calcium and magnesium are stripped from water entirely. Use this to rebuild baseline Ca/Mg before layering your base nutrients on top.
Coco and rockwool growers
Coco binds calcium and magnesium, making them less available to roots. RO water removes them entirely. This supplement restores what the medium and water can't provide.
Variable EC feeding (advanced)**
The real power of Athena Blended Line is flexibility. You can increase CaMg independently from your base feed during peak demand phases — stretch, early bloom, heavy fruit load. Separate the cal-mag from your A&B bottles and adjust to crop needs, not a fixed ratio.
Automated systems
Fully compatible with peristaltic dosers and venturi injectors. Mix into your tank or dose separately — the lack of sediment means zero risk of line blockage or emitter clogging.
Technical specifications
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NPK: 2-0-0 (Nitrogen 2%)
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Calcium content: Approximately 2%
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Magnesium content: 1.1% (water soluble)
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Iron: Included for supporting chlorophyll production and photosynthesis
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Format: 100% water-soluble liquid, pH-stable
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Sediment: None — fully dissolved mineral formula
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Available sizes: 32 oz, 1 Gallon, 5 Gallon
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Compatibility: Works with Athena Blended Line Grow A&B and Bloom A&B; system-agnostic for other base nutrients
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Application rate: 0.5–0.8 mL per litre or 2–10 mL per gallon of water
Who this is for
- Commercial and semi-commercial growers running automated fertigation systems
- RO water users who need to rebuild calcium and magnesium stripped from their water supply
- Coco and rockwool growers where media or water chemistry demands supplemental Ca/Mg
- Growers using the full Athena Blended Line ecosystem who want variable EC feeding flexibility
- Anyone running high-performance LED systems where calcium and magnesium demand increases beyond base nutrient provision
- Serious indoor cultivators who prioritise system reliability and won't accept clogging risk in automated lines
Our take
This is a professional-grade calcium and magnesium supplement designed by growers who understand automated systems and can't afford downtime. It's clean, precise, and built to work seamlessly within the Athena system without the clogging headaches that plague cheaper alternatives.
If you're running RO water, growing in inert media, or using any form of automated fertigation, Athena CaMg removes the guesswork and system risk. Worth picking up while stock lasts — proper kit engineered for reliability.
