Emerald Harvest Cal-Mag 55 Gallon Container Size:15 Gallon When you select the width

When you select the width and length of your system at the top

Lack of Magnesium results in stunted growth

the COGR board has the unique property of being able to absorb large amounts of nutrients

even coverage over a 3' x 5' growing area

Emerald Harvest Cal-Mag 55 Gallon Container Size:15 Gallon When you select the widthEmerald Harvest Cal Mag keeps your plants productive and green in any growing medium with our top quality calcium magnesium supplement. Keep your plants productive and green with Cal Mag, a calcium and magnesium supplement from Emerald Harvest. Containing top quality ingredients, Cal Mag is designed to nourish crops with extra calcium and magnesium and create the right conditions for abundant flowering and a heavy yield by utilizing its 2 0 0 NPK.