CalMag: Plagron vs. Biobizz

Google the labels for the products and compare there guaranteed analysis and ingredient list. CalMag Pro by Plagron NPK fertilizer (5-0-0). CaO: 5.7% Calcium Oxide MgO: 3.3% Magnesium Oxide No3-n?: 5.1% Nitrate? Hard to read one pic was very blurry and they don't post it on their main webpage. BioBizz CalMag NPK fertilizer (0-0-0)?? Cant find it online Ca: 3% Calcium Carbonate Mg: 1% Magnesium Sulphate The calcium in each product is not immediately available, oxides are hard bonds to break, I'd lean toward BioBizz CalMag or better yet get one that uses Calcium Nitrate and Magnesium Sulphate or Nitrate. Both are rapidly available. Some brands also include a bit of Iron aka Fe and fulvic/humaic acids in their CalMag solutions. I liked Metrop's CalGreen product. and can supplement the missing Mg from epsolm salts from the store.