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Hard water vs CalMag
whoawhoastarted grow question 6y 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 6y 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 6y 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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