Advanced Nutrients OG Organics Sensi Cal Mag Xtra Organic
Advanced Nutrients OG Organics Sensi Cal Mag Xtra Organic
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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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Calcium and magnesium correction that keeps a schedule organic
OG Organics Sensi Cal Mag Xtra supplies calcium, magnesium and iron from organic sources, for growers on reverse osmosis or soft water who do not want a mineral CalMag in an otherwise certified organic programme.
Key Benefits
- Organic calcium and magnesium - the correction without the certification problem
- Iron included - the third element that goes short on RO water
- Suits high-intensity lighting - transpiration drives calcium demand up sharply
- Works with any organic base - not tied to Iguana Juice
- Gentle on the biology - no salt spike to knock back a microbial population
RO water in an organic grow
Reverse osmosis strips out exactly the calcium and magnesium an organic base assumes your water provides, and organic bases carry less of both than mineral ones do. The result is weak roots, tip burn and interveinal yellowing at what looks like a sensible feed rate.
How to Use
- RO and soft water: 2 ml per litre added to plain water before the base feed
- Hard water: test first - usually unnecessary
- High-intensity lighting: up to 4 ml per litre through peak flower
- Mixing: into plain water first, never alongside a concentrated feed
- Media: soil, coco and hydroponics
Technical Specifications
- Range: Advanced Nutrients OG Organics
- Certification: Certified organic
- Elements: Calcium, magnesium and iron
- Typical dose: 2 to 4 ml per litre
- Best for: RO, rainwater and soft supplies
- Media: Soil, coco, hydroponics
| Water or stage | Per 1 L | Per 10 L |
|---|---|---|
| RO and soft water | 2 ml | 20 ml |
| High-intensity lighting, through peak flower | 4 ml | 40 ml |

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.