I hesitate to stick my toe into this water (pun intended). My water is very hard. (I filter it or use rain water now). It binds up the calcium and magnesium and my phals eventually showed symptoms, as did one of my Catts. I was advised to put eggshells in my Catt medium, and I switched to a monthly Cal mag supplement from Amazon. Once in awhile a symptom will arise and I give the plants a shot of epsom salts. That usually takes care of the problem. I don't have a scientific formula for this, I go by instinct and it's working.
Others will have a formula for you.
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