Why does the PH keep going up in my DWC buckets?

by Margo
(Harrisburg)

I have 2-3.5 gal DWC buckets that I have started seedlings in with General Hydroponics nutrients, currently at 500ppm. The little plants appear healthy and seem to be growing nicely. The PH creeps up to 6.4-6.7 every day. I keep putting drops of PH Down in them but they return to the higher PH within about 12 hours. I'd prefer to keep the PH at around 6.0 or a little lower. Am I doing something wrong? Should I leave it alone and see if they stabilize? Should I be doing something else? Thanks in advance for any help you can provide.
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Answer from Stella/Simon:
Hi Margo,
There will be some variation in nutrient pH from day-to-day and even from hour-to-hour. I think you are making this a little harder than it needs to be :-)

A range from 5.5 to 6.5 is fine for nutrient solution. Even as high as 7.0 from time to time is acceptable. I say let it go and let's see if it stabilizes. If it creeps much above 7.0, then I would add some pH down, very little at a time.

Hope this helps!

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Aug 26, 2016
Mine goes down
by: simulatorman

I have 3 3 Gal buckets and I use a combination of DWC and Bubbleponic in each. I use Fox Farm nutrients mixed in a 7 Gal bucket and divided 3 ways. I start out great at my weekly change outs but my pH drops down after two days and runs in the low 4's. Anybody have any suggestions.

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