'Cal-Mag', often referred to as cal mag for plants, is a growers term for fertilizers that provide plants with additional calcium and magnesium.
futureharvest.com
What are cal-mag supplements, and why are the important? Find out why these nutrients work so well as a pair, and exactly what they do to help weed plants grow.
www.royalqueenseeds.com
CalMag deficiency attacks new growth, causing brown spots and weak stems. Use this guide to diagnose symptoms, check your water, and correct pH immediately.
organitek.com
Через переводчик можно почитать )
Он нужен на осмосе , доводить до 150-200, еще смотреть по почве
Но когда вода 150 ппм и выше, и сверху калмаг - происходит переизбыток