Buffer that growing medium with calcium for strong cell walls and magnesium for chlorophyll production, too much sodium and potassium can cause overdosing, and thats no bueno. Treat coco coir or whatever growing medium you use with Cal/Mag. It s a delicious 12-2-12 product containing 6% Calcium and 3% Magnesium for consistently beneficial results. N-P-K 12-2-12.
