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I haven't flushed since the start of the problem which was a few weeks ago.

Ok, I now have it around 5.5 PH we'll see how it goes in a week or so.

Really? Well I'll see if I could keep it between 5.6-5.8 but seriously I don't see how a few tenths really matter.

Well what PH do you prefer if 6.0 is problematic

They do? I thought a PH between 5.3 and 6.5 were recommended in Hydro

Once a week.

The temps are around the low 80's to high sixties when lights are out. The water temps are a bit high like 75 Fahrenheit. I tried a few methods but none worked to consistently cool the reservoir.

The roots did have some brown areas. I was told the nutes I am using, Flora series from general hydro causes staining as well. To play it safe I added more air stones.(which I mentioned earlier) I now have 3 air stones in 3 gallons of water. So the water is bubbling like crazy. I am...

I am using a TDS meter my PH as I mentioned is roughly 6.0

I have two plants in DWC. After a week in I noticed yellowing. I checked the PH and it was off so I fixed it and now the PH is roughly 6.0. A few days later new leaf set appears and they too were yellow. I added nutes to about 350ppm. I let the nutes slowly rise to 450 as new green...

This is a picture taken before I fixed PH. New leaves have formed that are much greener as I mentioned earlier but I still have a problem. Also Yes I did fix the light leak that you may notice. It baffles me how new green healthy leaves appear and then the older leaves start to yellow like...

I am growing in DWC, DEEP WATER CULTURE. I am using 3 inch net pots in 6 gallon Tupperware. This is the same set up I have used for 4 other grows and had no issues.

I have two plants that started to turn yellow on the leaves. I checked the PH and found it was off so I fixed it. I waited a week and new leaves sprouted. The older leaves were still withering so I added some nutes, around 400-500ppm which I maintained.(I originally didn't have nutes since...

scratch that nutes are closer to 400ppm. I normally woud"ve had around 500 ppm by now.

Ok, I have new leaves but they too are yellow. This time they are yellow in between the veins. I added nutes and the ppm is a little under 300.

I was in a pet store the other day and I saw aquarium PH solutions as well as PH testers you can just suction cup to your hydro res. Can one use these things for a hydro set up.

Thanks mikMike, I'll re post as soon as the new leaves look good.

I think my problem was that I let the PH go. I had consistently good PH tap water for so long that I neglected to check it after my second grow. The two after grew perfectly. Now my fifth which is now is causing me problems I never had before.

Hey Matt, This is my 5th grow with this set up. I never had any problems before. If your so great then why don't you give some helpful advice.

Ok, to make sure I understand. I set the PH to 5.6 and wait till it goes to about 6.1 and then flush it. Put in new water with PH 5.6 and try to lower my res temp a little bit. When my plants start producing nice leaves I add a little nutes.