Update:
I’ve moved the system to the flower room and am testing for leaks and capacity 
I’m gonna have to upload the videos to YouTube or something and then post them here!
Stay tuned
Here is the video link so you can check it out.
Octopup System with auto fill - Flower Room
Thanks @GrouchyOldMan and everyone for your help.
At lowest level here are pics of the pots basically just touching the net pot. And I will adjust up with either a 3/4” or 1.5” board
Alright system is all setup and plants in them 
Let’s see how this goes 
I did notice that I filled the pots in the veg tent about 2 days ago and today when I moved them from pot to pot I tested the PH and man 2 of them were pushing 7 
so gonna keep an eye on that here.
SWEETNESS!
You really did an excellent job with this, @MNGrower!
My very best Grouchy wishes for a great grow! 
Thank you sir. 
Ok my people 
Couple days in on the autofill system. Here are a couple things I’m coming across.
Water profile:
So after a couple days my ph has risen to about 6.1 in the Rez and control box.
First 2 pots are at 6.1-6.2
Third pot is sitting more like 6.5
And they are in a line so the last in line is the highest.
Ppms are sitting the same as the Rez
I added ph’d water at 5.5 and calmag to about 160ppm and 1ml/gal of the fungicide.
I noticed that the fungicide up’s the ph so I need to add that before ph’ing the mix.
I do think the roots are good so I will be cutting out the fungicide from this point forward unless I see something with them.
Any thoughts how I can keep the ph more stable?
~ MNGrower
@GrouchyOldMan so I’ve been keeping an eye on the ph levels per pot and it does seem to be that they rise as you go down the line.
What I think is happening is that the pots have more pressure in them so as the last one drinks, it pulls from the other pots first as they have more pressure or water volume.
Could this be what is causing the ph to rise? I mean I’m not doing the manifold system here but I think the same would happen even with a manifold.
Side question, is there a check valve that could work under this low pressure?
Does this light change the nutrients chemistry in the rez?I ask because I Always get a Little funky smell or Brown Slime in my rez with canna nutrients.Though the nutes itself tell you to not put under Uvs or direct sunlight the Nutrient solution or you could change the chemistry of some molecules
In answer to your question, probably not.
I believe the consensus on pH rise in Octos is that the plant is taking up water at a different rate than the inorganic salts in our nutrients causing the pH to increase over time.
It is more of a healthy sign that the plants are feeding and you can see the EC or PPM numbers move down as the pH rises.
This chart has been posted before, but it’s my go to reference for understanding and managing Octo water chems. If you understand each of these cases you’ll have a pretty good handle on Octo reservoir dynamics.
These two are the most applicable cases for your question:
-Grouchy
PS, you are right about the possibility of water transfer between pots rather than directly from the Controller. They are all hydraulically connected but I think the main water flow is into each pot since they are all “drinking” so backflow into the other pots seems unlikely. But I’m just guessing…
@Andrexl my Rez doesn’t see light it is in a closet and in a black tote. I’m guessing though that the light would affect it over time.
@GrouchyOldMan i forgot you sent this to me 
Also as for the back flow, yesterday I dumped that one pot that has the highest ph, and turned off the 2 pots and let the flow happen from the controller only and it started filling slowly, then I cracked 1 pot and the flow doubled so I think my thought of equalization is happening to a point where the pots will give back some as one pot drinks faster and then when they equalize the controller will top it off but again I’m not a genius 
and learning this system
Greetings @Andrexl,
\Keeping the Octo reservoirs clean is more art than science, especially the main rez since it can sit for many days with gallons of nute soup at room temperature. That’s a recipe for funk & slime!
A good first step is minimizing the light getting into your reservoirs. Equally important is relying on inorganic nutes rather than organics. It’s a tradeoff, but especially if you are using those tiny tubes in our AutoFiller, the potential for clogging with organics is greatly reduced by avoiding organics. Just my opinion.
I have not read anything about the UVC light changing the chemistry of nutrients, but it does have a powerful effect in breaking down organic compounds so perhaps. These lights are designed for aquariums to keep algae and micro critters down and mine seems to be doing the job.
Yep, in that condition you’ll definitely get backflow from the other pots. In fact, now that I think of it, I often turn the valve off on an individual pot to let it draw down intentionally. For instance when I want to deliver a different nute mix to an individual plant, or just to give someone’s roots a little more air, or in the event that I need to do a complete reservoir change out like you described.
So, for sure there is backflow in all those conditions, but normally each of the plants is actively drawing water from the main rez and I’d expect the flow to be into, rather than from the individual pots.
Good discussion, thanks. 
-Grouchy
PS, just returned from a five day family emergency travel: Filled the main Rez, checked the enviros and walked out the door without a qualm. Returned home to healthy and happy plants despite a power outtage while I was gone! 
I have been building and testing my system inspired by @GrouchyOldMan for weeks now. Finally put it into action last night on 2 flowering plants. Today I will increase it to 4. Mistakes were made… The splitter I got had a HUGE inlet so I had to run to the grow store and just find parts and tube to make that part work. So a huge bulkhead was added to the control to meet up with the splitter. My small bulkheads from amazon work fine but did not come with rubber washers. So I just put a silicone sealer on the outside and everything has been water tight for a week of testing without plants. I also screwed up my control container, my lowest water level is too high. I need to install the float valve lower in the container so I have more of a range I will actually use. But for now I will just adjust the height of the pots and the control until I have time to rebuild the control.
I am gona be looking to add some features to keep the system clean but I wasn’t really planning on putting nutrients in the water as I usually just top dress the soil.
NIce job @Greenup!
Sorry you had the extra hassle of tubing size mismatches to contend with. I think I inadvertently posted a pic of a manifold with that large sized inlet port, but I don’t recall where. Hope it didn’t mislead anyone…
Totally my own fault. I didn’t even think to check! I just saw one on amazon and clicked. That’ll learn me! I wanted to point it out so others don’t make the same mistake. I have a buddy who might build one and I plan to help him make a better one 
I ran canna nutrients when I did DWC, I can confirm the funkiness.3ml/gall of 37% peroxide cleared it up for me.
I still haven’t had a funk in my pots or Rez yet.
Started my first Rez on the 16th with 4 gallons of nutrients and about 3 days later I added another 4 gallons. I’m about down to 2 gallons maybe 3 in the Rez
Well 8 days in the flower room and 8 gallons used. These things are growing really good
I did my final training and some trimming and had to separate the plants a bit
Individual pics are from a couple days ago before I trimmed and trained.
Setup looks so clean and nice. Very good work! Plants look amazing as well. I love the look of those bases, wish i had those instead of every other type out there haha. Whats the cultivar?
These are Wookie Blue Balls and 1 Jack Herer.
