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Emerald Harvest Cal-Mag55galEmerald Harvest Cal-Mag is more than just a calcium-magnesium supplement. Cal-Mag contains kelp extract, a natural source of nitrogen and other helpful compounds. Cal-Mag helps minimize the risk of calcium or magnesium deficiencies when you use coco coir and other growing media, provides chelation to help your plants absorb more nutrients and results in greener, stronger, more productive crops.
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