What does PPM stand for? on the back of the advanced nutrients

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Originally Posted by Illusion

Parts per million (PPM), and Electrical Conductivity (EC), both the same thing, two different units of measurement.

Americans tend to use PPM more often, and europeans use EC more often.

You need a TDS electronic pen reader (Total dissolved salts) which tell you the PPM (parts per million) of the TDS of the water.

This is how you know how strong your nutrient strength is.

Roughly 500ppm equals 1 EC. therefore, 300ppm equals .6 EC, 250ppm equals .5 EC.

tap water is normally about 300ppm, when you add nutrients- obviously the ppm will raise.

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The tendancy of using PPM comes from industry standards. If you pull out a NIOSH pocket guide, or any MSDS, most all of the measurements (including IDLH, and weighted averages) are expressed in PPM.

Im sorry I feel like an idiot. All my container shows is the ppm chart. I guess my real question is how i determine how much to give my plants based on that ppm chart.

Sensi Grow (Part A & B) this link will show you everything that is on my container.

Here is a picture of the plants if that helps.

http://img151.imageshack.us/img151/4774/dsc00182zm1.jpg

http://img352.imageshack.us/img352/7476/dsc00181tk9.jpg

Here Sjaap plug your info in to this Chart

thank you so much. that is exactly what i needed