Because growing with coco coir can cause puzzling nutrient deficiencies, you need a 2-part base nutrient that solves this problem for you. Heres how pH Perfect Sensi Coco Grow does it. First, it delivers just the right amount of potassium to avoid toxicity of this element, which is already abundant in coco. Second, it contains chelated forms of magnesium and calcium that resist binding to coco and feed your plants instead. Third, and most importantly, it provides the missing piece of the coco puzzle: diversely chelated forms of iron that fix any iron deficiencies that growing in coco can cause. And if that werent enough, you can throw away your pH meters and pens forever! The proprietary pH Perfect Technology keeps your pH in the sweet spot all week, every week with no measuring or tweaking. As always, youre fully protected using pH Perfect Sensi Coco Grow because our Grower Guarantee ensures your 100% satisfaction.