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new grower - rising ph


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  #1  
Old 06-19-2017, 03:24 AM
mosfetti mosfetti is offline
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Default new grower - rising ph

Hi,
I'm new to Hydroponics and I've succesfully built an outdoor hydroponic system (tubings) to grow some lettuce.

I've stable EC of 1.2 (800ppm circa), quite stable temperatures in a range between 19C and 24C, but I can't stabilize PH. I'm taking it down to 5.5 but overnight it comes back to 7.6 (tap water PH)

Plants look healthy but a little slow growing, and I'm sure the reason is high PH so basically plants can't get Ca, P, Mn, Cu, Fe, and Zn.

I've tried to add some acids like malic acid, acetic acid, citric acid, but with no success. As I said, I was getting the required PH level, but overnight it comes back as my tap water.

Plus: I've cleaned my system already, I've cleaned my reservoir, I've done everything I could but with no results at all.

Any suggestion?
Thanks

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  #2  
Old 06-19-2017, 06:08 PM
GpsFrontier GpsFrontier is offline
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Hello mosfetti,
What nutrients are you using?
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  #3  
Old 06-22-2017, 05:26 PM
Jtrjesse Jtrjesse is offline
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Default Need more info

What kind of system do you have? How big is your Rez? How many lettuce are you growing in it? And how big are they now? Do you know your Ec or ppm? If so is it falling, rising, staying the same?
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  #4  
Old 06-23-2017, 06:58 AM
Scrub Scrub is offline
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I'm no expert but I'll chime in anyway.
Rising ph, static ec and falling water level is normal.

What I do to stabilize my ph, I raise my nutrient strength slightly until I find the sweet spot. Too much and the plant gets overfed, not enough and the ph swings.
As the plants get bigger and start eating more, you'l notice more ph swings.
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