500 or 700 scale?

rarebreed619

Active Member

• Sep 10, 2013

• #1

Hello all had a quick question, when using AN ph perfect base do I use 500 scale or 700 scale ec? Or does it matter?

 

Nizza

Well-Known Member

• Sep 10, 2013

• #2

i like using 700 scale personally but not for any reason

 

superstoner1

Well-Known Member

• Sep 10, 2013

• #3

It has nothing to do with what nutes you use, it is a conversion factor for different ways of measuring tds when using a meter.

 

M

machead

Well-Known Member

• Sep 10, 2013

• #4

AN use the .500 scale if thats what you mean

as sure they say get your ppm to 1080ppm dont unless u wanna burn the hell out your plants start of at 1/4 strength an build from there

 

rarebreed619

Active Member

• Sep 10, 2013

• #5

machead said:

AN use the .500 scale if thats what you mean

as sure they say get your ppm to 1080ppm dont unless u wanna burn the hell out your plants start of at 1/4 strength an build from there

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hit the nail right on the head, yeah I don't really follow the rec dose kind of see what the plants want and go from there. Thanks everyone for the advice.

 

I

ilikecheetoes

Well-Known Member

• Sep 11, 2013

• #6

dont use that idiotic scale and just use microsiemens (EC) like the rest of the non pot growing world.

 

O

oxanaca

Well-Known Member

• Sep 11, 2013

• #7

ilikecheetoes said:

dont use that idiotic scale and just use microsiemens (EC) like the rest of the non pot growing world.

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TDS is pretty goofy, im not sure why anyone uses it. i actually dont even measure conductivity anymore, i use actuall PPM based on how many grams of calcium nitrate, mag nitrate, MPK, ect. i add per gallon of water. only way ive found so far that makes any sense.

my formula in ppm is

120 N
60 P
300K
120 Ca
60Mg
70S
7.5Fe
not sure on the rest of the chemicals but i use peters S.T.E.M. micronutrient blend. at 7.5ppm iron