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Adjust PH before or after adding nutrients?

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8 replies to this topic

#1 playclothes420



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Posted 09 June 2011 - 10:40 AM

Do I adjust the PH of my water before I add nutrients, or after?



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#2 nutogrow


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Posted 09 June 2011 - 10:42 AM

After. Nutes change the ph.
Don't put you ph meter in ro water either.

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#3 arc



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Posted 09 June 2011 - 10:53 AM

That's a mistake you'll only make once.

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#4 McLovin'


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Posted 09 June 2011 - 02:54 PM


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#5 Doobie Brother

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Posted 10 June 2011 - 10:22 AM

After. Nutes change the ph.
Don't put you ph meter in ro water either.

Just wondering why you say not to put your probe...well, not YOUR probe, but your pH probe in ro water ?

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#6 floger


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Posted 12 June 2011 - 06:51 AM

yeah. What happens to it in ro water?

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#7 marna4163



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Posted 12 June 2011 - 12:37 PM

in well water do you have to check the PH in it

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#8 Simo man

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Posted 12 June 2011 - 01:08 PM

I hate retyping it, so ill copy and paste for you guys.

Why not to use your Ph meter to check RO water..

Salt ions in a solution always flow from an area of high concentrtion to an area of low concentration until they reach a balance. The solution in a pH probe is an ionic solution typically made up of silver ions and potassium chloride ions in a high concentration. By putting the pH probe into RO water or distilled water you are putting it in a solution of low salts ion concentration (possibly zero salts ion concentration).

Anytime you put the probe into the low ionic strength water the ions slowly move into the low ion concentration water and some of the low concentration water flows into the pH probe. This appreciably shortens the lifespan of the probe as the probe soution is diluted. It also greatly decreases the time span required between each recalibartion. The storage solution is basically very near to being the same solution used inside the pH probe so ion transfer during storage is minimal/negligible.

Some pH probes use a gel for a sloution, this slows ion transfer buy does not stop it. Gel pH probes are slower to respond due to this slower ion transfer.

But yeah, disaster strikes when you try using your pH meter for this purpose to check RO water. Use a litmus test kit if concerned, why make things difficult.

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#9 nutogrow


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Posted 12 June 2011 - 01:53 PM

And ther ya go and there ya have it... Thanks Simo Man. Most ph probes say right on the box not to put em in straight r/o.

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