pH level jumps won't stop!

[Ganja Ganja]

Ok so I wasn't going to post anything about this, but its now been 3 days in a row and its down right frustrating.

The setup:
See my sig for more details, but its a bubble bucket DWC running the Lucas Formula with plain RO water addback.

The Problem:
3 nights ago I went to bed with the res pH at 5.7. I woke up in the morning with the res's at 7.2 pH and couldn't believe my eyes. I calibrated and recalibrated my pH tester in disbelief. Once I realized it was right, I pulled out the entire solution, pH'd it back to 5.7 and put it back in. Went to bed, woke up in the morning, pH was at 6.7.

Same thing 2 days in a row. I've now pulled the entire res out, pH'd it and put it back in 4 times in 3 days. This is getting extremely annoying, especially cuz I'm scheduled to flower tomorrow.

Any idea why my pH would be jumping almost 2.0 every night when I go to bed? I have an AC unit so the grow room stays between 73-78 never varies.


Thanks in advance!

[Chronitron]

I'm having this same problem right now. The EXACT same problem. My reservoirs say 5.7, 5.8 everytime I leave. Come back a day or two later and it's either up at 7 something or it's down in the 4's.

Definitely subscribing to figure it out.

[Ganja Ganja]

Just FYI, I performed two FULL reservoir dump and refills... pH'ing both times to 5.7 just today. It is now back up to 6.3. 2 hours ago it was at 5.6. If it weren't for the surplus of trainwreck I'm staring at I'd pull my freakin hair out.

[Ganja Ganja]

Ok, I'm ready to scrap this whole grow I've never been so frustrated.

Day 5, woke up this morning... pH is now at 7.0 again. It was at 5.7 less than 12 hours ago. What the fuck am I supposed to do? I cannot continue to keep changing the res in and out like this. This didn't start happening until week 4 of veg. I would like to begin flowering today, no one has any ideas why this is happening?

[Ganja Ganja]

Update -

We've been calculating the pH's movement. Its going .1 about every hour and 30 minutes.

Like I said we're planning on flowering today so we need to flush anyway. I'm going to flush it out with 3x res water and re-nute. Updates to come. I hope a guru see this and can offer some advice, this is killllller

[Chronitron]

Add PH down. That's about the only thing I can think of. This way you don't have to keep dumping the res everyday. I really hope everything works out for you and your trainwreck.

[Outdo0rMaster]

ok , in which phase of growin are your plants ...

if you just continuous brong new haver but good part of old stay it can be problem with pH
second, plants have own time when she fuck up pH cause sex detirminating/hormone making and that is more then obvious when you have only females ... no matter if is clone and you are sure to that is female plant.

dry up basin,new water new nutes new correction

[Ganja Ganja]

Originally Posted by Chronitron

Add PH down. That's about the only thing I can think of. This way you don't have to keep dumping the res everyday. I really hope everything works out for you and your trainwreck.

Its not Trainwreck, its Ice... the trainwreck is just helping me through these problems ;-p.

I was dumping the res and refilling it because I thought that the pH solution may have been getting stuck in the clay pellets or the roots up top. After testing this hypothesis I realized I can just put pH down directly in and its fine, so I'm doing that now, but still seeing a .1 jump in pH every couple hours.

I have a spreadsheet going now, checking the nutes every 2 hours so I can put together some useful data.

The plants are late veg, ready to flower as soon as I fix this little issue.