how high is too high?

[Dizzworth]

I wanted to see what everyone was running there ppms at in the undercurrent? I know the strain has alot to do with how high you can crank it but was curious what other people are running them at? What ppms are you maxing out to? In what week does it max out? I heard from a friend less is better with this system but i had a problem last time from not giving them enough with a heavy feeder. please chim in

 

[babyhughie586]

i ran Dutch Master from 250-600max.. I am now trying out Ionic Nutes and im maxing at 650ppm and they are super healthy and happy i am in week 4 flower.. I will pry bump them up to 700 week 5 and 750ppm week 6... 750ppm will be the max that i goto

 

[BudGoggles]

Im using DM and running it 250- 700 ppms max in bloom

 

[gettogro]

900 max with Wifi and h&g
700 max with my chemdog

I dont think anyone goes above 1000 anymore

 

[ttystikk]

what conversion are you guys using?

I second this. Too many 'ppm' scales out there, just making things confusing. Let's use EC instead; it's the basis for all the other scales, it's a direct measurement and it's always the same.

I've run my EC as high as 2.4 (1200ppm @500), but I generally keep mine below 2 as well. I have poor results below EC 1.0

 

[woodsmaneh]

Understanding what ppm scale to use
CF and EC are measures of electrically charged nutrient ions in a solution. Pure water will not conduct electricity. Water usually conducts electricity because it is full of impurities, in our case, electrically charged nutrient ions. The two black dots on the end of Bluelab nutrient probes are called electrodes. When these are placed in a solution, an electrical current passes from one electrode, through the water to the other electrode and counts the number of electrically charged ions present. This represents the units measured - CF or EC.


ppm measures parts per million. ppm is known as dimensionless quantities; that is, they are pure numbers with no associated units of measurement. A mass concentration of 2mg/kg - 2 parts per million - 2ppm - 2 x 10-6.
There are many different scales used for different industries around the world and for many different reasons! Did you even know there are more than two scales? The most widely used scales in Hydroponics are the 500 scale, 650 scale and the 700 scale.
What's the difference? The ppm 700 scale is based on measuring the KCl or potassium chloride content of a solution. The ppm 500 is based on measuring the NaCl or sodium chloride content of a solution and is also referred to as TDS - total dissolved solids. Individual nutrient ions have different electrical effects! The true ppm of a solution can only be determined by a chemical analysis. ppm cannot be accurately measured by a CF or EC meter. They are present on Bluelab products as a conversion guide only. The conversion is as follows;
2.4EC x 500 = 1200ppm (500 scale) or 1200ppm / 500 = 2.4EC
2.4EC x 700 = 1680ppm (700 scale) or 1680ppm / 700 = 2.4EC
If you are reading from a book that says you should grow your crop at 1100ppm - how do you know which scale the writer is referring to? Is the scale on your ppm meter right for the job? If the book was written in the USA, it could be the 650 or 500 scale. If the book is written in the UK, it could be the 700 scale. If it was written in Australia, well it could be any of the three!
If you must grow using ppm, you will need to know the following;
§What ppm scale is the book referring to?
§What ppm scale is your meter using?
§Which standard or calibration solution should you use for your meter?
§What ppm scale is the nutrient formula referring to?
We have a conductivity converter that can help you to determine what the ppm may be on your meter or in your book. If we start off with a general idea of where certain crops should be grown using EC or CF as a guide, then this can help determine what ppm the instrument, book, website etc could be referring to. If you need help to determine what conductivity your crop should be grown at we also have a nominal value chart that may help.

 

[woodsmaneh]

I run at 500 to 850 using Canna or Dutch Master or H&G. I have moved to Canna and H&G as I can't get a deal on the DM anymore. I need to find a new wholesaler in Canada anyone know one?.

 

[BudGoggles]

Conversion .5