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Oh yes this is a constant problem in hydroponics. The only source of soluble calcium is Calcium Nitrate. It is Nitrogen along with the Calcium by its chemical makeup. It makes it really hard to have low N with the needed calcium levels.
Relax ,I’m not using it... lol last time I send the lady for anything plant related though..
You a raw wholesaler? Lmao
The cal mag has a lot of N I find,
But it did work well when I tried it(RAW) just a lot of N in the complete line
In soil there are choices like Lime or Dolomite lime, oyster shells etc. that can add calcium without N.