Hi all! I would Like start hydroponics AS my new Hobby but it seems bei a Lot Tricky in EU for a newbie. In EU ist not allowed Any Nitrate and im already few months looking for Any Not expendive solution. I ve got npk with Ratio 15:15:15, Epson Salt but i cant find Any water soluble solution for Ca+. Eggshels in winewinegar=Impossible im Not a Millionaire 🤣. Any advice pleased ?