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I use RO water in mostly reused soil with no lime added back so i have had many a Ca and Mg issue! Just started adding epsom and soluble gypsum but still think the once a week dose of 50ppm each is not enough cuz sour hound is having Mg issues! May try cutting back my feed amounts so i can put it into reservoir and the 2 I can’t once a week will be plenty for them!