Ppm

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kushismycolonge

Member
Im wondering what the difference is between a EC and a TDS? I'm looking to start growing and i am looking for a way to measure ppm's? I'm planning on buying one along with my digital pH meter? Can someone please shed some insight and clear up the difference for me? Any help is appreciated.
 
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kushismycolonge

Member
Okay that helped to a certain extent. Im still unsure if I need a TDS or a EC meter to measure PPMS? That link helped but it also confused me alot as well. I am rather new to this and over the last week i have been taking in a lot of information.
 
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SickSadLittleWorld

Well-Known Member
Most meters have the ability to read both EC and TDS.

EC is a much more accurate measurement of dissolved solids in the water because it is universal between meters. TDS/PPM is a conversion from EC and the conversion factor varies from meter to meter, thus cannot be directly compared unless you are using the same conversion factor. What is important is you reference the numbers YOUR meter is displaying to reach optimal results. The ppms I use may not work for you.
 
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kushismycolonge

Member
Thanks for the link do you plan on getting all this?

Qty ID Details Reg. Price Sale Price USD
5521B Nutra-Dip pH $139.95 $135.95 5521A Nutra-Dip PPM $99.95 $96.95 5521C Nutra-Dip Tri-Meter (pH/PPM/Temp.) $232.95 $221.95 5521D Replacement pH Electrode $79.95 $76.95
 
Cali.Grown>408

Cali.Grown>408

Well-Known Member
for my HANNA meter basically its another way to measure ur ppm..if ur ec says 0.1 its = 50ppm...... 0.2 ec = 100ppm so basically ever 0.1 it goes up it goes up 50ppms also..maybe somebody put a link up for u but this is off the top of my head and i dont wanna go google it and paste it one here so hopefully u get it now..keep it growing
 
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SickSadLittleWorld

Well-Known Member
Cali.Grown>408 said:
for my HANNA meter basically its another way to measure ur ppm..if ur ec says 0.1 its = 50ppm...... 0.2 ec = 100ppm so basically ever 0.1 it goes up it goes up 50ppms also..maybe somebody put a link up for u but this is off the top of my head and i dont wanna go google it and paste it one here so hopefully u get it now..keep it growing
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Yep, that is assuming a conversion factor of .50. Some meters read .5, some read .7, some read somewhere in between, and others are user configured. I know with the Hanna EC/TDS/Temp meter, you can set the conversion factor. You need to specify your PPM with your conversion factor because the PPM measurement using .5 and .7 is going to differ pretty substantially, especially at higher nute concentrations. I read somewhere that the proper conversion factor is .64, so that is where I have my meter set. However, I prefer to use EC since it is more universal.
 
Cali.Grown>408

Cali.Grown>408

Well-Known Member
SickSadLittleWorld said:
Yep, that is assuming a conversion factor of .50. Some meters read .5, some read .7, some read somewhere in between, and others are user configured. I know with the Hanna EC/TDS/Temp meter, you can set the conversion factor. You need to specify your PPM with your conversion factor because the PPM measurement using .5 and .7 is going to differ pretty substantially, especially at higher nute concentrations. I read somewhere that the proper conversion factor is .64, so that is where I have my meter set. However, I prefer to use EC since it is more universal.
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what? are u saying im doing my measurements wrong? ur got me thinking shit
 
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SickSadLittleWorld

Well-Known Member
Cali.Grown>408 said:
what? are u saying im doing my measurements wrong? ur got me thinking shit
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No but if someone says, "ya, 800 ppm works perfect for me" that isn't helpful because you don't know what conversion factor their meter is using. Now if I said, .9 EC, .9 EC on your meter would be the same nute concentration as .9 EC on my meter. Does that make sense?
 
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