Can’t stabilize PH on DWC

After a lot of research, I bought a DWC system. I put tap water in systen and left it on for 24 hours before adding the nutrients (biobizz). I added the nutrients (Bio-grow, root juice and Call-mag) and got 400PPM and adjusted the PH to 5.8. I transplanted 1 plant from the soil to the system with 2 weeks of growth. the plant started showing signs of bad PH, which I started to monitor every 2h, which I found that my PH rises sharply to 7.5 / 8 in 2h, but my EC remained the same. the plant eventually died. I have studied the system in many ways. and everyone will give the same. with or without plant, with or without nutrients in the water ... I put the ph at 5.8 and in half a dozen hours, it goes up to 7.5 / 8 ...

I have read some things that say that the PH down of biobizz as it is organic only uses citric acid that cannot leave a solution in water stabilized for a long time. for that the indicated is to use a ph down that contains phosphoric acid.

any idea how to solve the problem?

should I try to use the PH down from GHE that uses phosphoric acid?

I thank the help of all you. thanks

i'd put all those nutes away for now. use non organic nutes in dwc.

I can’t use my biobizz nutes um hydro?

Pucanz said:

I can’t use my biobizz nutes um hydro?

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i wouldn't use anything organic in hydro. especially for a new grower.

Going to agree with that. Shit causes all kinds of problems.

Unless you got experience and a water chiller i would recommend a pure salt based nute. What ever is local to you and available.

Ok Alright mates thanks for the help. But for example, let's just talk about clean water now. I cleaned my reservoir and turned it on again. I left it on for 24h and measured the ph, it was at 8. Put some PH Down from biobizz and I left the ph at 5.6.

2 hours later and I started measuring again, it was already 7.5.

Wtf is that? I do not understand. Even without nutrients, PH does not remain stable, grrrrrr

Should be a PH down off Biobizz ??

I would like to be able to stabilize the PH in clean water first before trying to buy new nutrients... And I'm not even able to do that xD Makes sense?

there arent' enough buffers in your plain water to stablize pH for very long.

don't even bother trying to do that: you'll drive yourself crazy

can you get GH products where you are at? a bag of maxibloom, a bottle of cal/mg, and GH pH up and down is all you need.

save all that biobizz if you ever grow in soil.

Pucanz said:

should I try to use the PH down from GHE that uses phosphoric acid?

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Personally I use phosphoric without hesitation. It breaks down into phosphorous which the plants uptake/need anyway. But the breakdown is slower than citric.


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I currently have the same problem, I flushed the plants with tap water few times. I just ordered some H2O2 and will start adding it into solution. What I find strange is I use GHE tri-part with platoon green sensation and sugar royal and when I start adding ph-down and put 1ml it goes from 7.8 to 6.9. Then I add another 1ml and it goes from 6.9 to 6.75.

1. Do you know what can cause the the raise of pH?
2. Do you know why there is a different jump of pH after adding similar amount of pH-down?

You can't stabilize the ph with GHE's tri part? Are you using the GHE ph down? When you put the ph at 5.8 how long does it go up? and how much does it go up?

1. I am not an expert in the matter, I opened this post to try to understand that. Rkymtnman said that my problem was my organic nutrients. And that I should even use GHE, but if you do, do you have the same problem as me?
2. This should not happen I think, the same amount of ph down should always lower the same amount of ph.

But let the more expert people speak, I just have experience planting in the soil ...

If your doing hydro use hydro nutes organic dosent have to ph so not much buffer agents or if any .hydro nutes have ph buffer agents in them and that's what stabilize the ph also if doing hydro try not to use soil to start your plants you will have problems with that use rockwool or something similar

Pucanz said:

Ok Alright mates thanks for the help. But for example, let's just talk about clean water now. I cleaned my reservoir and turned it on again. I left it on for 24h and measured the ph, it was at 8. Put some PH Down from biobizz and I left the ph at 5.6.

2 hours later and I started measuring again, it was already 7.5.

Wtf is that? I do not understand. Even without nutrients, PH does not remain stable, grrrrrr

Should be a PH down off Biobizz ??

I would like to be able to stabilize the PH in clean water first before trying to buy new nutrients... And I'm not even able to do that xD Makes sense?

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Your irrigation water is most likely carrying a considerable amount of alkalinty in the form of dissolved bicarbonates.

Regardless of the type of acid being used, until you've added enough to completely neutralize the bicarbonates present in your water, the pH is going to drift up over time (talkin' "clean" water here).

pH meters measure hydrogen ion concentration in solution, not alkalinity.

..... hydro nutes have ph buffer to stabilize the ph I use well water so my ph are 8 and 9 just adding gh 3 part drops it down to 6.5 without ph down

landooo said:

with platoon green sensation and sugar royal

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what are those? are they organic? if so, skip them.

Pucanz said:

This should not happen I think, the same amount of ph down should always lower the same amount of ph

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not really. if my res EC is 1.0 it will take more pH down to lower it than if the EC was 0.5

I don't think moving a plant from soil to DWC hydro a good idea. It seems like it might introduce things to the water that should not be there

You may be feeding dissolved carbon to citric acid loving Cyanobacteria. They’ll eat it up in about two hours and dump enough bicarbonate to fizz.

Switch to Jacks 3-2-1.
Problem solved.

Check microbe diversity is high. Sponge filter.