RAW Calcium Magnesium
RAW Calcium Magnesium
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Order by 3pm Mon–Fri — we aim to post same day · FREE Express Delivery over £60 · 1–2 working days · Free Wembley pickup
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A precise cal-mag correction, not a guess
RAW Calcium Magnesium delivers 15% calcium and 3% magnesium in a fully water-soluble form, built from a precise combination of calcium nitrate and magnesium sulfate. Calcium and magnesium deficiencies are among the most common lockout issues in fast-growing, high-EC feeding programmes, particularly in coco and RO-fed hydro systems where the source water carries little of either mineral naturally.
Because it is a straight two-element product, growers can dose it independently of the base feed to correct a deficiency precisely rather than switching an entire feed line to chase one issue.
Key Benefits
- 15% calcium, 3% magnesium, fully water-soluble
- Corrects cal-mag deficiencies common in coco and RO-fed systems
- Sourced from calcium nitrate and magnesium sulfate
- Doses independently of the main base feed
- Suits soil, coco and hydroponic systems
How to Use
- Add to the reservoir at every feed where the base or source water runs low in calcium or magnesium
- Dissolve fully before combining with other nutrients
Technical Specifications
- Guaranteed analysis: 15% Calcium, 3% Magnesium
- Source: calcium nitrate, magnesium sulfate
- Format: soluble powder

FREE Express Delivery on orders over £60. We aim to post same day for next-working-day arrival — order by 3pm Mon–Fri. Delivery is 1–2 working days. A few harder-to-stock or large, bulky items can take a little longer — we'll tell you if that applies to your order. Heavy-item surcharges are always shown at checkout before you pay — we only ever charge what delivery costs us. Prefer to collect? Free pickup at our Wembley store.