What PPM should a natural water source very rich in Ca and Mg be diluted with RO down to?

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Hey all



I live in a part of Canada where our groundwater is extremely rich in Ca and Mg naturally, and I'd like to utilize this in place of synthetic CalMag additives. However, natural PPM is 350 out of the tap.



RO water works perfectly in bringing this down as low as needed with simple additions, so my question is, what is the ideal PPM for a coco and soil grow, both? I'm experimenting with both.



I figure the soil is much more flexible but would still have an upper limit before it calcifies. And the coco is probably much more important to keep in check.



I have meters and would like assistance, thank you!

 

[FelipeBlu]

I would try to keep Ca around 100ppm or so, and Mg not much more than 50ppm or so. Do you have a water report?

And welcome to !
The best place on the interweb!

 

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Hi! I found this from 2016

 

[FelipeBlu]

Pretty good on Ca and Mg. And the Na and Cl aren’t too bad either. Looks like your hardness is from carbonates and bicarbonates, which have little effect on the plant. If you dilute it with RO, you would probably have to add some CalMag.

 

[triangle]

Pretty good on Ca and Mg. And the Na and Cl aren’t too bad either. Looks like your hardness is from carbonates and bicarbonates, which have little effect on the plant. If you dilute it with RO, you would probably have to add some CalMag.

That's amazing!! You think I should just use it after I run it through the dechlorinator ? Even if it's a higher hardness @ 350ppm or so ?

I live in a rural area full of farmers who grow massive fields, I guess I should've expected it should be mostly OK right from the tap as I'm sure they are not treating it before spraying acreage

 

[FelipeBlu]

Should be good to use as is.

 

[Lve2toke]

Thoughts about these numbers ? After bubbling for 24 hours ppm was 102 and ph was 7.4 I fed them some yesterday and they seem to be fine

 

[FelipeBlu]

Sounds good if you are in soil.

If you’re in coco, you should adjust the pH into the 5.6-6.0 range.

 

[Lve2toke]

Sounds good if you are in soil


If you’re in coco, you should adjust the pH into the 5.6-6.0 range.

I phd the water down to 6.0 to 6.5
My soil is a mix
Bottom third roots organic w 16 oz super soil and top two thirds is roots organic with mother earth. Been phing around 6.5

 

[FelipeBlu]

Sounds great. Where’s your journal? I’ll head over.

 

[Lve2toke]

Lve2toke: Soil, First Grow Journal 2020

I got me an airstone and pump finally lol. They are on 12/12 as of wends night 9p-9a. Gonna get some defoliation done today then I'll try and get some new pics up

www.420magazine.com

 

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Hi Guys I got new updated figures here

the pH is way off though it comes out of my tap under 7