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Hard water vs CalMag
whoawhoastarted grow question 5 years ago
I don't have EC/PPM meters, but I know that I have hard tap water, according to my city water distribution company. Do I need to suplement CalMag on my feedings? How much should I use if I don't have PPM meters here? What are the risks of using or not using CalMag in this case?
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UmFzbXVzanswered grow question 5 years ago
Plants grown under LED lighting require more Calcium and Magnesium generally, even with hard water.
That said, I have grown several plants fully under Quantum Boards without CalMag supplements, so it's not a complete nessecity.
I use 1ml/L in vegetation and 2ml/L in flower.
Your girls will spend about a week indicating that they need CalMag before doing anything crazy, so learn to listen to the living plants -- and keep a cannabis deficiency chart on hand for reference :) If left unchecked, it can lead to stunted growth and diminished yields.
OutForRealanswered grow question 5 years ago
If you are using GHE nuts then buy the soft water micro if your water is hard , like that you will not have to bring extra cal mag because the soft water micro is more charged than the hard water in term of cal/mag so if you are using it with a water already charged in Cal/mag then no need to add extra cal mag
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