Renfro
Well-Known Member
No and Yes. I would imagine people have downloaded and added their products to the list.
Understanding and Calculating Nutrient PPM
- Thread starter Renfro
- Start date
froggyboy44
Member
Very, very helpful. I use Jacks and it will be interesting to see how it works out. thanks for the excellent work.
Hello Renfro and RIU.
I understand the math given in the first post and that's what i usually do.
But lately i've been playing with Hidrobuddy and found some things beyond my understanding:
I load Magnesium Sulfate, which is already on the database. Enter 50 desired Mg ppm for 1 liter of water and it says that i must add 0,5g to that liter of water. We are going good, it's what i calculated (since it's a example i'm going with Mg being 10% instead of 9,7%).
This 50 Mg ppm come with 65 ppm of S = 115ppm
But Hydrobuddy also stated that predicted EC value is 0,4mS/cm which is 200ppm.
So...if i added 0,5g/L, shouldn't it be 500ppm of MgSO4.7H20, for a EC of 1 mS/cm?
I start guess to H and O atoms "do not count". Im pretty ignorant at this point.
Mg and S add for a total of 115ppm. But in that case...isn't that a EC of 0,23mS/cm?
Where does the 0,4mS/cm expected EC come from? Or where i am failing in understanding this?
I now confirm that the accurate tool to measure is a weight scale, which i own and use...but at one point i thought that i could just add salts and read the ppm on my tds pen. Now i understand that they are not compatible in that way. I mean...if i just add magnesium sulfate to a liter of water and wait until i read 500ppm more on my pen, that would be a lot of salts, more than 0,5g/L.
I understand the math given in the first post and that's what i usually do.
But lately i've been playing with Hidrobuddy and found some things beyond my understanding:
I load Magnesium Sulfate, which is already on the database. Enter 50 desired Mg ppm for 1 liter of water and it says that i must add 0,5g to that liter of water. We are going good, it's what i calculated (since it's a example i'm going with Mg being 10% instead of 9,7%).
This 50 Mg ppm come with 65 ppm of S = 115ppm
But Hydrobuddy also stated that predicted EC value is 0,4mS/cm which is 200ppm.
So...if i added 0,5g/L, shouldn't it be 500ppm of MgSO4.7H20, for a EC of 1 mS/cm?
I start guess to H and O atoms "do not count". Im pretty ignorant at this point.
Mg and S add for a total of 115ppm. But in that case...isn't that a EC of 0,23mS/cm?
Where does the 0,4mS/cm expected EC come from? Or where i am failing in understanding this?
I now confirm that the accurate tool to measure is a weight scale, which i own and use...but at one point i thought that i could just add salts and read the ppm on my tds pen. Now i understand that they are not compatible in that way. I mean...if i just add magnesium sulfate to a liter of water and wait until i read 500ppm more on my pen, that would be a lot of salts, more than 0,5g/L.
Renfro
Well-Known Member
Could it be accounting for a higher H2O content in the salt?
(Sorry I didn't see this post till just now)
Renfro
Well-Known Member
Remember that EC is not always equal to or even very close to an elemental PPM (mg/l). This is because EC is just measurement of electrical resistance.
CloudHidden
Well-Known Member
George2324
Well-Known Member
Hey @Renfro
I’ve been getting stuck into this lately and I hit a roadblock and couldn’t figure out something.
I was searching for a non hydroshop silica product to reduce my costs. I found a supplier in Europe of one which appears to have 9x more potassium in the bottle than protekt. But only 6 x more silicate
How’s that possible
here’s the label of protekt
Potassium (K2O)___3.7%
Silicate (SiO2)___ 7.8%
and this is Maxwell bullet potassium silicate
Potassium (K2O) 33.60
Silicate (SiO2) 40%
Both derived from potassium silicate so what gives on the ratio? How can protekt claim to have so much less potassium than silicate or Maxwell claim to have so much more?
Surely the ratio should always be the same or am I missing something?
cheers
I’ve been getting stuck into this lately and I hit a roadblock and couldn’t figure out something.
I was searching for a non hydroshop silica product to reduce my costs. I found a supplier in Europe of one which appears to have 9x more potassium in the bottle than protekt. But only 6 x more silicate
How’s that possible
here’s the label of protekt
Potassium (K2O)___3.7%
Silicate (SiO2)___ 7.8%
and this is Maxwell bullet potassium silicate
Potassium (K2O) 33.60
Silicate (SiO2) 40%
Both derived from potassium silicate so what gives on the ratio? How can protekt claim to have so much less potassium than silicate or Maxwell claim to have so much more?
Surely the ratio should always be the same or am I missing something?
cheers
George2324
Well-Known Member
I thought potassium silicate was a fixed compound. So you can buy pure k2o and sio2 and add them to a bottle?
George2324
Well-Known Member
Damn have you just given me the holy grail?
Silicon Dioxide
Silicon Dioxide is mainly used as a flow agent in a variety of industries. It is used in pharmaceutical tablet making. Silicon Dioxide doesn’t interfere with any active ingredients within supplements. Silicon Dioxide has an extremely high melting point. Shipped within 1 working day subject...
I can just buy this and add it directly to my res?
Renfro
Well-Known Member
Orthosilicic acid - Wikipedia
en.wikipedia.org
George2324
Well-Known Member
Sio2 is never water soluble though. According to Wikipedia so how do they add them to nutrients?
according to RAW nutrients that sell pure sio2 They say this:
Although silicon dioxide (Si02) is not very soluble, finely-powdered forms are “flowable” and become readily available to the plant.
George2324
Well-Known Member
That sounds like it’s theoretical. Doesn’t look like I can buy itOrthosilicic acid - Wikipedia
George2324
Well-Known Member
That’s why I thought these nutrients didn’t have this sio2 in it. They use potassium silicate which is soluble and you can’t chAnge the amount of potassium and the amount of silicate in the chemical compound potassium silicate.
George2324
Well-Known Member
From research it looks like 0.12g per l of sio2 is soluble in water.
so theoretically you can have 120ppm of sio2 which is more than enough.
But how do I work out how much of that 120ppm sio2 is silica and oxygen?
I think it’s aproximately 46% silica
so 0.12g per l of diatoms or silicon dioxide in hydroponics will give you 55ppm silica
From another page:
“You can dissolve several tablespoons of Diatomaceous earth in liter of water, and then pour the solution into a sprayer bottle to spray onto the plants. The water will actually allow the powder to adhere to any leaves or plants that you spray it on – when the powder dries, it will activate and become effective against bugs.”
Several tablespoons in a litre of water is a lot more than 0.12g I’ll have to buy some and test
so theoretically you can have 120ppm of sio2 which is more than enough.
But how do I work out how much of that 120ppm sio2 is silica and oxygen?
I think it’s aproximately 46% silica
so 0.12g per l of diatoms or silicon dioxide in hydroponics will give you 55ppm silica
From another page:
“You can dissolve several tablespoons of Diatomaceous earth in liter of water, and then pour the solution into a sprayer bottle to spray onto the plants. The water will actually allow the powder to adhere to any leaves or plants that you spray it on – when the powder dries, it will activate and become effective against bugs.”
Several tablespoons in a litre of water is a lot more than 0.12g I’ll have to buy some and test
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CloudHidden
Well-Known Member
Been recently looking into Si. It seems like the Amour Si (Potassium Silicate) I've been using is basically doing me no good - coco/perlite DTW. It's my understanding that it takes at lease weeks for microbes to break down Potassium Silicate to become plant available. That's not happening in my case.
I found Power Si, which they try and make sound all mysterious, but it just monosilicic acid @George2324. Problem is, like so many nute companies, they are charging a fortune for their special sauce - $250 per liter. So fuck that. Am currently looking for another source for monosilicic acid. If anyone knows of one please let me know!
I found Power Si, which they try and make sound all mysterious, but it just monosilicic acid @George2324. Problem is, like so many nute companies, they are charging a fortune for their special sauce - $250 per liter. So fuck that. Am currently looking for another source for monosilicic acid. If anyone knows of one please let me know!
George2324
Well-Known Member
As I explained above monosilic acid is just sio2 dissolved in water.
sio2 is silicon dioxide and is soluble in water at 0.12g per l.
diatoms are mostly silicon dioxide and is a very fine powder so much easier to dissolve. I’m gonna give that a go