DWC: Day 30 of Flower PH dropping to 5.0 for NO reason

Cold$moke said:

Can you post pics of the plants and roots with white lights?

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I don't even really have a smart phone. Its a pain in the ass to post pics.. 1 of the plants didn't crash to 5.0 tonight, it was at 5.6 when I took the reading.

Meast21 said:

I'm an expert DWC grower and I've never really seen this before. I have 2 clones into different buckets and different tents and about 1 week ago the ph would drop to 5.0. I tried lowering the ppm from 1050 to 850 and the ph is still doing this. These are clones of clones and the previous batch didn't do this. The only thing I can think I did was remove to many leaves for light penetration, but I highly doubt this is the cause. Please help.

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Whats your start ph? What nutes?

Cold$moke said:

Whats your start ph? What nutes?

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When ever in flower I keep them at around 1000. Technaflora

Whats the start PH.

havent used that one personally does it usually make ph rise or fall.?

Also is your ppm spiking when the plants do this?

Meast21 said:

PPM was around 1000-1050... I thought I would try dropping it to 825 range to see if it help stabilize the ph and it didn't

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is the water level dropping? Is the EC climbing or getting lower when this pH drop occours?

Cold$moke said:

Also is your ppm spiking when the plants do this?

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I think you and I are sniffing on the same trail haha

HydroRed said:

I think you and I are sniffing on the same trail haha

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I think thats a good thing lol.


I dont wana say it but is your guess humidity, vpd?

Or high ec thats what im rolling with if its not root rot

Im passing out though lol

I had similar symptoms when i drop rh for harvest

It gets the buds crystally but kinda just stalls out lol then ec rises .

Im like fuck that since half the room is still booming so i bumped the rh back up to 40s

HydroRed said:

is the water level dropping? Is the EC climbing or getting lower when this pH drop occours?

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Yeah I think the water level is dropping a little more than usual, so I gets the plants are drinking more.

HydroRed said:

is the water level dropping? Is the EC climbing or getting lower when this pH drop occours?

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NO I don't think the ppm was dropping, I added more water to lower in on purpose trying different things.

Meast21 said:

NO I don't think the ppm was dropping, I added more water to lower in on purpose trying different things.

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Ok, so water level is dropping (they are still drinking) ppm was static at approx 1000 (until you added water to drop the EC) and pH is dropping -correct?
Do you adjust your pH last after adding nutes etc? Do you use a pH down when you make up your res? What is your starting pH and how fast does it drop to ph of 5.0?

HydroRed said:

Ok, so water level is dropping (they are still drinking) ppm was static at approx 1000 (until you added water to drop the EC) and pH is dropping -correct?
Do you adjust your pH last after adding nutes etc? Do you use a pH down when you make up your res? What is your starting pH and how fast does it drop to ph of 5.0?

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Yeah I use ph down after nutes.. Starting ph is around 6.0 and I'm guessing it takes anywhere from 4-6 hours to drop to 5.0

HydroRed said:

Ok, so water level is dropping (they are still drinking) ppm was static at approx 1000 (until you added water to drop the EC) and pH is dropping -correct?
Do you adjust your pH last after adding nutes etc? Do you use a pH down when you make up your res? What is your starting pH and how fast does it drop to ph of 5.0?

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Not sure if you know, but I have 2 clones doing this from the same mother. They are in different rez's in different tents. No other plants in different tents are doing this.

I've never known plant type or strain to affect pH like that if thats what you are insinuating? Are the 2 clones from the same momma that are in a different tent the only plants in that tent?

Well all this blabber could have been saved by 2 pics

I wanna see your roots
If you're a dwc expert why the trouble? Especially every 30 plants it happens?


If your start ph is 6.0 then drops over night to 5.

Try phing your mix at 6.4 then see what she does.

Im still suspect of roots, humidity, and high ec.

My max is usually 1000ppms mabey little more or little less depending on the strain



Save time get 2 pics up

Edit to add not being a dick but you get the idea

I am going through this late in flower too now. Before the PH was stable or slightly rose but now it is dropping about 0.20 every 12 hours. I'll start at 5.9 and end up 5.7, I'm using more tap water to my RO and it helps keep it more stable.

This thread http://www.thctalk.com/cannabis-forum/showthread.php?85568-Why-is-PH-falling-in-DWC talks about how not high enough EC can also cause EC rise due to osmosis, though I don't think that is the case here.

In the thread, the Woody J user explains it pretty good.

I thought i had issues when i switched my nutrient line

Turns out the ph range is just opposite.

As in normally i would set ph to 5.8 and let it rise to 6.3

Now i start at 6.3 and let it fall to 5.8 works awsome as i dont even need ph down much anymore.

Cause if you add enough ph down to make it 5.8 right off the bat it will PLUMMET to 5 by the next day.

Yup take it slow on the PH change and let the roots do the work, less PH up or Down the better. Plus my water is extra hard with spring run off right now at 260ppm. takes a shit ton of PH Down to move it even a little lol.

HydroRed said:

I've never known plant type or strain to affect pH like that if thats what you are insinuating? Are the 2 clones from the same momma that are in a different tent the only plants in that tent?

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Yup 1 plant each tent.. 5 hours ago I raised the ph to 6.2 now its back at 5.0