Use this Jack's LX blend when you are using a very pure water source. This can be from a Reverse Osmosis filter or a naturally occurring source like rain water. Formulas designers at JR Peters ensured this blend will deliver the desired 4:1:4 macro nutrient ratio along with 3% Calcium and 1.5% soluble magnesium. The potential for pH change with this formula is very little as this formula deliver a Neutral CCE.
