Understanding and Calculating Nutrient PPM

Renfro

Renfro

Well-Known Member
I don't really use their mix, just make what my plants want. I've used a LOT of mixes over the years, you can do pretty much anything with the trio.

Right now I am playing with the Chem-Gro 4-20-39 stuff, it's locally made and cheap as fuck. Figured I would take a stab at it and see how it performs.
 
ttystikk

ttystikk

Well-Known Member
Renfro said:
I don't really use their mix, just make what my plants want. I've used a LOT of mixes over the years, you can do pretty much anything with the trio.

Right now I am playing with the Chem-Gro 4-20-39 stuff, it's locally made and cheap as fuck. Figured I would take a stab at it and see how it performs.
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They were great in terms of support for me; call them and ask about that precipitate you were seeing. I'm curious to hear what they say.
 
Renfro

Renfro

Well-Known Member
ttystikk said:
They were great in terms of support for me; call them and ask about that precipitate you were seeing. I'm curious to hear what they say.
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Yeah I should give them a call, the lady on the phone was nice when I ordered. Their mixing instructions mentioned not to exceed one pound per gallon of water when making a concentrate, I think my 60 grams in about 800ml of water would be within that number (95 ish).
 
ttystikk

ttystikk

Well-Known Member
Renfro said:
Yeah I should give them a call, the lady on the phone was nice when I ordered. Their mixing instructions mentioned not to exceed one pound per gallon of water when making a concentrate, I think my 60 grams in about 800ml of water would be within that number (95 ish).
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Yeah, that's less than 450g/gal, lol

Still, it would be interesting to hear their thoughts.

I'd ask if the precipitate is just filler and what's dissolved is all that's needed.
 
Renfro

Renfro

Well-Known Member
ttystikk said:
Yeah, that's less than 450g/gal, lol

Still, it would be interesting to hear their thoughts.

I'd ask if the precipitate is just filler and what's dissolved is all that's needed.
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Well the precip doesn't happen if I use a larger volume of water. I am wondering if I should try it with RO water instead of tap water.
 
Renfro

Renfro

Well-Known Member
ttystikk said:
Yeah, that's less than 450g/gal, lol

Still, it would be interesting to hear their thoughts.

I'd ask if the precipitate is just filler and what's dissolved is all that's needed.
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so about 840 ml RO h2o and 60 grams 4-20-39 on the stir plate. Initially looks ok but after a few minutes its all milky looking. letting it settle out now.

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Keesje

Keesje

Well-Known Member
@Renfro
Do you keep the ratios between Calcinit and your other Nutes the same? Or will you give less Calcinit once your plants are in bloom?
 
F

fancythat

Member
This is a great thread, and I thank you for sharing your hard work. I have a question: I feed 5ml/G (9oz in 55 gallons) floranova bloom, total elemental ppm says 284. My blulab ppm pen shows an increase of 640ppm. So 284 of the 640ppm is usable? Should I be feeding more?
 
_EQ

_EQ

Active Member
Renfro said:
Just tossing the latest version up here, the schedule feature hasn't had any work done on it but more products were added. I need to work on that schedule feature but I have been busy and just haven't been motivated to mess with it.
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Cool I’m a programmer myself would like to poke your brain sometime about the code if your willing to give up the secret source code
 
Renfro

Renfro

Well-Known Member
_EQ said:
Cool I’m a programmer myself would like to poke your brain sometime about the code if your willing to give up the secret source code
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There is no secret source code, all the code that's in there is rudimentary and right there in the file to be edited and changed as you see fit. The only real "code" in there is on the buttons, like the one that clears the input values or the ones for the schedule feature that I wanted to add but never got around to making functional. As to the calculations performed by the spreadsheet, most of the multiplication happens in the matrix tab lol. Sounded cool :) Let me know if you have any questions but most of the calcs are performed in the cells on the sheets.
 
A

Apocalyptical

Active Member
A simpler way is to convert the L into gallons. If you know that a half gram is 95 PPM, a gram is 190 PPM (which is mg/L). A gallon is 3.785. 190/3.785 = 50.19. Same thing with 77.5 leading us to 40.95. I find that its easier to digest for the non-math folk (as a person who understands what is going on).
 
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