Phosphorus DEF due to low PH?

Hi guys, a week ago I found out that my PH pen was reading +1.0 and refused to calibrate, I have since been using drops while I wait for my new meter to arrive. Anyone care to offer an opinion?

GH trio to 1.2ec
Sealed room CO2 grow in RDWC
temps lights on 28°c lights off 23°c

Yup! Get the ph straight and it'll clear right up.

Ok so my new pens came today, with the drops im bang on with my PH at 5.8 but I also got a second EC pen and that's showing 1.6 not 1.2 like the old one! Im so fed up with ph/EC pens

Did you get the cheap pens?

Renfro said:

Did you get the cheap pens?

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Yep, cant afford a good one right now!

noob12345 said:

Yep, cant afford a good one right now!

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Well there you have it. That's why you are fed up with it.

but I have only just got these, last PH meter cost me 50€ and it was a piece of sh*t, at least this one you can calibrate with screwdriver to buffer... 50€ one refused to calibrate in the end... this EC meter is exactly the same but measuring 0.3 higher after ec 1.0, I did read somewhere about not putting them in RO water.

Having unreliable meters is worse than having no meter at all.

Definitely don't put a pH pen in RO or distilled water.

Your right except that my system takes so much water I have no real way of knowing how many litres exactly so have to go by EC. What about an EC meter in RO?

Renfro said:

Having unreliable meters is worse than having no meter at all.

Definitely don't put a pH pen in RO or distilled water.

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im currently backing the EC down to 1.0 from 1.6 to hopefully sort out the lockout issues.

An EC meter is fine in RO.

You could fill your system with 5 gallon buckets to see what the capacity is.

noob12345 said:

im currently backing the EC down to 1.0 from 1.6 to hopefully sort out the lockout issues.

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Hmm. I generally run around 2.0 EC but everyones grow is different.

what nute line? I run GH which runs at a lower EC than others I beleive!

I run GH three part with Armor Si and Calimagic. I am usually at 1000 - 1200 PPM. 1000 PPM = 2.0 EC.

its weird, the one that has gone out of calibration is fine up to 1.0 then goes badly wrong!

Renfro said:

An EC meter is fine in RO.

You could fill your system with 5 gallon buckets to see what the capacity is.

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Grab a truncheon, they last forever and are extremely reliable, no calibrating.

at 0.5? that seems high to me! how are you not burning the shit out of them? is that in RO? the pics look like lockout though? starting to wonder now lol.

How do you know it never needs calibrating? have you tried it in a calibration solution?

Renfro said:

Bluelab Commercial Truncheon Meter

With a conductivity range right up to 6.0 EC (60 CF, 3000 ppm x 500 and 4200 ppm x 700), it will never leave you short. The Bluelab Commercial Truncheon® Nutrient Meter has been designed for hydroponic crops that require a higher than normal EC or ppm requirement during their growing cycle. Its...

www.zenhydro.com

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in DWC?

Renfro said:

I run GH three part with Armor Si and Calimagic. I am usually at 1000 - 1200 PPM. 1000 PPM = 2.0 EC.

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