Do most people use .5 or .7 on ppm meters?

kryptoniteglo

Well-Known Member

• Oct 20, 2012

• #1

Hey Folks,

Just got a proper ppm meter and am setting the plan for a new DWC grow. I have two 2-week-old seedlings ready to start on 1/4 nutes soon.

When reading through threads, most people talk about ppms as an absolute number. But are they most likely referring to the .5 conversion or the .7 conversion? My meter lets me chose which.

For example:
3-4 weeks (1/4 strength) = 200-400ppm
5-6 weeks (1/2 strength) = 500-700ppm
6 weeks+ (full strength) = 800-1100 ppm

Would that be the .5 or the .7 conversion?

Thanks in advance for the answer!!!

KG

 

devolv

Active Member

• Oct 20, 2012

• #2

It's strange that your meter lets you choose. most companies just choose .5 or .7.

 

kryptoniteglo

Well-Known Member

• Oct 20, 2012

• #3

I can choose EC, CF, 500ppm or 700ppm.

Is your conversion .5 or .7? Which do most people here refer to?

 

devolv

Active Member

• Oct 20, 2012

• #4

hanna uses .5 i believe

 

kryptoniteglo

Well-Known Member

• Oct 20, 2012

• #5

And is that the standard that most people here refer to when I read their descriptions of their set ups? Thanks!

 

insan3

Well-Known Member

• Oct 20, 2012

• #6

If i am correct north america uses .5 while europe use .7 my ppm pen does both

 

kryptoniteglo

Well-Known Member

• Oct 20, 2012

• #7

Ok, thank you!

 

waterdawg

Well-Known Member

• Oct 21, 2012

• #8

My tester also lets me set conv. factor but it also does EC.

 

firsttimeARE

Well-Known Member

• Oct 21, 2012

• #9

Just use EC, shits universal.

 

BigBuddahCheese

New Member

• Oct 22, 2012

• #10

firsttimeARE said:

Just use EC, shits universal.

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As well more accurate. I used ppm for the longest time then went to ec

 

Malevolence

New Member

• Oct 22, 2012

• #11

I don't see why it matters anyway... the ppm my plants and setup needs to find that sweet spot is going to be different than yours anyway. Any ppm advice you get is going to have to be adjusted for your setup so essentially it's useless advice other than a general low medium high reference.

 

kryptoniteglo

Well-Known Member

• Oct 22, 2012

• #12

Malevolence said:

I don't see why it matters anyway... the ppm my plants and setup needs to find that sweet spot is going to be different than yours anyway. Any ppm advice you get is going to have to be adjusted for your setup so essentially it's useless advice other than a general low medium high reference.

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I agree. I was just looking for a starting place. Thanks!

 

waterdawg

Well-Known Member

• Oct 22, 2012

• #13

I don't see why it matters anyway... the ppm my plants and setup needs to find that sweet spot is going to be different than yours anyway. Any ppm advice you get is going to have to be adjusted for your setup so essentially it's useless advice other than a general low medium high reference.

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What he said..lol. I have 2 tables running and the one table is into 2.5 weeks of 12/12. it is running around 1100 TDS .7 conv, and it still raises every day. the other table is running 975 and it is staying stable but only 2 weeks into veg. So I know the first one is a slow feeder where as the second table is eating up the nutes nicely. These are two different strains with different needs. IMO it is more important to monitor the plants needs than the actual levels recommended. Keep notes, lots of notes and let the plants tell you not other people. Thats not to say the people here are not a great help as I would have been lost with out it!