There are very few homeowners using hydro for gardening, green hoses or hoi use plants so there are very few hydro products solf for general hydropoic use. There are many water soluble fertilizers that are made for use wiyj soil grows and someimproperly call them hydro fertilizers. For examplethere is Miracle grow, and Stearns, but neither contain calcium or magnesium, and both cause pH declines in the nutrients solution almost dailydue to all their nitrogenbeing supplied by urea and ammonium nitrogen rather than Nitrate nitrogen. They work well with soil grows if a bit of dolomitic lime is added to the soil, but dolomitic lime is a solid that does not dissolve in a hydroponic solution.