To keep the things On-Topic, I moved my post from the other thread to this one. ray-the-pilot:
I don't know why but I can' open your word document's!
But are you comparing values from your setup with values from Tom Barr tank setup?
(I didn't read Tom Barr post that you linked.)
But the values and conclusions can not be compared they are from completed different setup's!
Can I propose you to do the following experiment?
(I can't do it because I broke my PH Controller and I have my co2 running without it.)
1) Trim the plants like you usually do.
2)Take a picture of you tank.
3)Run you tank with the ph controller for a week.
4)Measure the PH in your tank in 5 or 6 points, in the morning in mid-day and at night before lights go off.
This is the second part of the experiment:
5) Unplug the PH controller from the solenoid valve, use it only to measure PH.
6) Open or close your co2 needle valve until you have the desired PH/co2 level in one spot.
(this may take some days, start low and go high until desired value.)
7) Using the picture you have taken the week before, cut your plant to the same size.
8 ) Run the tank without the controler for a week.
9) Measure the PH at the same time of day and same point you measured in 4)
10) post this measurements here!
Almost for sure you will get this conclusions:
-With controller the PH will not fluctuate much, maybe 0,2PH(?)
-Without controller you have bigger PH fluctuation, maybe 1PH,
but you will have the same death/hot spots than you had with controller.
Do you accept this "challenge"?
(I did'nt read this thread yet.... give me 1 or 2 days... to update my readings!