100% RO water CalMag problem

Jeeyah

Jeeyah

Well-Known Member
Findus said:
Yes you´re right. It´s impossible to really understand this in 4 weeks holiday.


Nice, but why epsom salt as it´s a Ca deficiency?
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I see a magnesium deficiency. Interveinal chlorosis on the older lower growth. I get the same exact symptoms if I don’t use epsom salt. I don’t use CalMag anymore.

Every once in a while I stop using it or try to reduce the dosage to see if it’s needed. Then, I start seeing interveinal chlorosis again. It takes time to work too. The only way to get the plant to absorb it quicker is to foliar feed. I don’t recommend that.

I hope this helps.
 
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Lord Kanti

Lord Kanti

Well-Known Member
Findus said:
Hey guys,

it´s my first grow using CalMag (I use Advanced Nutrients Sensi Cal Mag).

I´m on soil, day 25 of veg. My tap water has 1.3 EC, 218mg/L Ca and 43mg/L Mg.
I use 100% RO water and add around 50% of recommended dosage CalMag so I get around 0.3 EC.

Before, I used a multi mineral salt for fish aquarium. It worked nearly perfect in combination with 100% RO water on soil but has only 25mg/L Ca and 6mg/L Mg at 0.3EC.

Now at 0.3EC CalMag my plants show a Ca-deficiency.

Is it possible that it´s because I just go half of recommended dosage? But full dosage would be around 0.6EC-0.7. Another thing is, there is kelp in it which could be the reason of the EC?!

I just think 0.7EC for base water without nutrients is too high...

Does someone have experience with CalMag or 100% RO on soil?
I grow for around 5 years, I know how to water etc. so it has to be CalMag product problem.

Thanks a lot

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I didn't read your post. First I have to ask: why are you using RO water? There are many growers that pay to strip out calcium and magnesium from they their water, then pay to add it back in with expensive supplements. Have you checked what's in your water? Public water has publicly available data with everything laid out. There are plenty of snake oil salesmen out there looking to make a buck.
 
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