CAL-MAG PLUS 5 GAL.
http://www.amazon.com/dp/B00443ZIN8?tag=bungasapi-20
Feature
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CAL-MAG PlusTM is a bio-catalyst for plants. A beneficial plant nutrient correcting the inherent problem of calcium, magnesium and iron mineral deficiencies found in most soil fertilizers and some hydroponic nutrient liquid concentrated formulas.
http://www.amazon.com/dp/B00443ZIN8?tag=bungasapi-20
