New Grower Should I use CAL-MAG?

:toke:-- yup, some Ca-Mg is wise when using RO/Di water,.. this will help stabilize pH in solution as well, just make sure the Ca-Mg you use has carbonate in it, as this is the ion that's directly involved with ph buffering in solution,... because RO/Di, or any really low ppm water has very little to no CaCO3 in it, the buffering is gone... this makes it prone to wild pH swings from even small inputs,... (don't bother trying to take a pH of such water, the meters get confused of sorts, because of how they work).... Always add the Ca-Mg first, and let it sit after stirring well for a few minutes to react some,.. then add nutes, and adjust pH if needed,...
That said, I'm not sure I see any symptoms of Mg defc., or that I can tell in the pics at least,.. 3rd pic with the funky leaf formation, it looks like a flash reflection, or is it actually paled out like that?
....the color on the petioles is more likely normal expression, especially in a BB strain,... true, P defc., sometime K too, can cause this, but it's not a reliable symptom alone because of this,... :smoking:
 
:toke:-- yup, some Ca-Mg is wise when using RO/Di water,.. this will help stabilize pH in solution as well, just make sure the Ca-Mg you use has carbonate in it, as this is the ion that's directly involved with ph buffering in solution,... because RO/Di, or any really low ppm water has very little to no CaCO3 in it, the buffering is gone... this makes it prone to wild pH swings from even small inputs,... (don't bother trying to take a pH of such water, the meters get confused of sorts, because of how they work).... Always add the Ca-Mg first, and let it sit after stirring well for a few minutes to react some,.. then add nutes, and adjust pH if needed,...
That said, I'm not sure I see any symptoms of Mg defc., or that I can tell in the pics at least,.. 3rd pic with the funky leaf formation, it looks like a flash reflection, or is it actually paled out like that?
....the color on the petioles is more likely normal expression, especially in a BB strain,... true, P defc., sometime K too, can cause this, but it's not a reliable symptom alone because of this,... :smoking:
Thanks I got some cal mag coming to start adding to my distilled water... should I be adding iron too? Since it doesn't have anything..
 
Why use calcium if you have a magnesium deficiency? Where are the pics of the deficiency? Am I missing it? First pic on the left looks like the plant is underwatered. Cool mutant leaves. My plants often have purple stems on the fan leaves where the stems are exposed to light
GL
 
Why use calcium if you have a magnesium deficiency? Where are the pics of the deficiency? Am I missing it? First pic on the left looks like the plant is underwatered. Cool mutant leaves. My plants often have purple stems on the fan leaves where the stems are exposed to light
GL
Because I'm using distilled water, they say I should add cal mag to it
 

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Do you have the option of not feeding them distilled water?
 
I can but my tap water is really high. Than again the distilled water is lately. Like a 5.2 and my tap water is around 8
 
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