I like biobizz calmag for it’s organic and has no N. Most are calcium nitrate not calcium oxide based
I’ve been liking the Plant Magic MagneCal
Total Nitrogen (N) 8.0%
Nitric Nitrogen 7.0%
Ammoniacal Nitrogen 1.0%
Water-soluble calcium oxide (CaO) 7.1%
Water-soluble magnesium oxide (MgO) 3.5%
Iron (Fe) chelated by EDTA 0.04%
Manganese (Mn) chelated by EDTA 0.01%
Zinc (Zn) chelated by EDTA 0.006%
Works well between 0.2-0.4EC I find.
obviously this time I’ve been at 0.2 and probably should have been using 0.4 but hey ho lol.