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- Soft water and RO (reverse osmosis) water lack baseline Ca and Mg â Cal-Mag compensates
- Coco coir actively binds calcium ions, making additional supplementation essential
- Calcium deficiency: brown leaf edges, tip burn, blossom end rot in fruiting crops
- Magnesium deficiency: interveinal chlorosis (yellowing between veins) on older leaves
- Typical dose: 2â5 mL per litre depending on water hardness and base nutrient formula
- Add Cal-Mag to water before base nutrients to prevent precipitation