You should use the one in the nutrient brand line first choice. Otherwise you can use any Brand of Cal_mag. You can mix in a little Dolomite Lime for a longer much slower solution. Be forewarned that if you overfeed and need to flush the dolomite lime is not likely to come all out. I am sure there are products out there I have never heard of or tried. In hydro there is only 1 choice for Ca and it comes with a lot of Nitrogen - calcium nitrate. This is also the backbone for some brands.
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