How much calcium and magnesium?

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I understood MSU was developed by Michigan State University (hence the name) and that it was supposed to be a fertilizer designed to have most everything that most plants would need. Not specifically an orchid fertilizer. I keep hearing that orchids quite often need more calcium than many plants, especially Cattleyas. I can see the R/O MSU being designed for greenhouse and hydroponics systems including orchids and therefor having more calcium, becauset most people won't be using R/O water on crops and gardens.