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RO water with GHE tripart nutrients = calcium defiency?

Hey guys, simple questions if you have any experience on the matter:

So my tap water is essentially RO, with only 0.08 EC.
Now I got 2x plants in hydro (2x NFT) and the other plant is showing decent amount of Calcium defiency while the other doesn't virtually have any defiency.
I'm just wondering if the other plant is just overly hungry for Cal? (plant with defiency = barneys Sweeth tooth#1 and the happy plant is barneys Pineapple Chunk)

Have you guys had calcium defiency with RO water...

RO water with GHE tripart nutrients = calcium defiency?


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