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The Uk Awesome Member And Growers Thread

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The Uk Awesome Member And Growers Thread

ghettogrower 40,093 Replies 2,635,631 Views
Page 1639 of 2005 · Replies 32,761–32,780 of 40,094
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#32,762
Ninjasmoker said:
The 2 big girls at the back are girl skunk cookies (gsc x skunk#1) Last time i ran them they didnt stretch as much as this run , everything was nice and level about a week ago !

The stretch looks nice and full of bud sites though so im hoping to get some big fat skunk#1 style spearheaded tops :)

Theres 2 girls in the middle that are tres kush x DNL-D

the 2 at the front are smile x rku (left) and Gay13 clone (right) ;)
Click to expand...
U got the g13 already?
 
#32,779
Which ppm scale should I 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.
 
#32,780
@Desertboy i completly forgot to reply to your pm mate .... my wife has got the car over the next few days ... umm im free maybe sunday , otherwise its going to be next wednesday unless you fancy a drive round mine pal
 
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