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Make sure you meter is calibrated. I had the exact same problem when I was using spring water. After I switched to distilled my Ph has stayed consistent much longer. It might be the Ph down your using, not sure if theres a difference between powder or liquid but I use Technaflora Ph down and it...

Sweet news..it was the spring water I was using. After I switched to distilled the Ph stayed at 5.8. I also found a chart on the AG website the tells you not to use spring water :-|

Yea I pretty much do the same thing. After I add the nutes it drops the Ph of the distilled water so I just raise it to 5.8 then it goes into the res.

I will pick up a ppm meter as soon as i get the cash. Right now I'm using the liquid tester..it's a pain but better than nothing

Yes i have 2 airstones running and the aerogarden pump runs until the roots hit the water. I just changed out the res and refilled it with distilled water this time, so far the Ph has remained consistent. I usually mix my nutes in a gallon jug..wait a few minutes then add Ph down. Then I check...

To all the AG users, how often are you adjusting your Ph? I know having a smaller res requires you to check Ph more often but it seems like mine fluctuates every couple of hours. I'm using spring water, Foxfarm nutes and Technaflora Ph down. Could it be the cheap ass spring water from Walmart...

Looking good Tek. I'm doing diesel ryders in the AG also..what week did you start the nutes and at what strength?

Plants look great man..what are you using to adjust the PH?

First off I would like to say that I've spent months of reading and learned a lot of great information from RIU. It's pretty much all I do in my free time now lol. Heres my question..I know that 2700k and 3000k bulbs are used for flowering but I came across this site that has me confused. Heres...