My setup;
2 pants in 10 gallon fabric pots
Under hlg scorpion diablo (18 inch above canopy)
No added co2
Vpd is 1.3 (flower)
Promix hp
Jacks ro formula
My watering schedule is feed, feed, feed then slight flush with tap water. These are 48 hours apart when the pots are not fully dry but are ready for feed/ water.
On jacks nutes feed chart it says flower nutes ec should be 2.3. Would you feed at 2.3 or less like 1.8ec? If you would do less why would jacks recommend 2.3?
When I mix jacks at full strength according to their feed chart I come out with a ppm of around 890. 40ppm of that is silica.
An ec of 1.7(850) has worked well for me in coco.
Iv never used that part A, I use 5-12-26. I’m sure some actual ppm numbers might change but it’s common to not get the ec they claim at full strength.
This is what they sent me.
I dont mix using a gallon as directed. A quart for each to mix. Concentrated nutes.
I pour about an inch of concentrated nutes. Maybe 4000 ppm and dilute down with water until desired ppm obtained, then pH.
Doesnt take long to get idea of how much to start with before diluting.
1/4 inch of concentrated nutes filled is about 200 to 400 ppm, ideal for seedlings to clones. Too easy,
Ill have a gallon jug a third filled with concentrated nutes.
@Autos-only that is part a. 5-12-26. Lol.
Part a 5-12-26
Part b (calcium nitrate) 15-0-0
Epsom Salt
The standard full strength works front to back no problem. Variations in PPMs are dependent on how accurately you weigh it up and water source.
Jacks offers several different nutrient regiments, make sure you get the feed schedule that fits with the program you are going with.
I’ve noticed their charts done exactly like up with their nutrients in terms of EC. Idk why.
I don’t understand what you’re saying? It was mentioned they are using 12-4-16.
I was simply explaining they also call for the same 2.3ec in the 5-12-26 mix but those numbers are never met for me.
I mix at full strength and get 850ppm with great results and I don’t think it would benefit from mixing stronger to achieve 2.3ec.
I use 321 exactly as directed. I just dont add a full gallon of water. Add water as needed to dilute to desired strength.
I heat one for part A and epsom, helps disolve, peeps say let it sit, it disolves, i see granules of epsom if not heated and stirred. Part B, dissolves rather easy.
I was just responding to this 
5-12-26 is part a
And I agree with the ec, I often run lower than that with good results.
Edit
Now I see the confusion LOL
@BladeRus I guess in most simplified way I can say it is, if you’re already running full strength and not achieving the numbers they claim you should I wouldn’t worry about it. Unless the plant it telling you it needs more which has never been the case for me.
Full strength is full strength and it does a great job of it!
I do know jacks does not recommend the medium EC to go over 1.0 more than your input.
The team over at jacks is great! They sent me merch and posted one of my pictures on their FB page! Great great company!
Read lots of successful auto growers approach to feedind and ppm. I was targeting upto 1200 ppm middle of flower, i think some handle it, some dont. Have backed down to less than 1000ppm on this grow and may have best yield every on 6th banana grown with less is better.
Ohhh I gotcha! Haha! Is the other kinds not called part A?
Ppm 500 scale or 700 scale? So i can convert your numbers to ec
Dang just ran out of likes. They have 2 part a variations. One with nitrogen, one without. The other products are all in one. So 1 part systems. The OP has a feed schedule for the 1 part systems.
Edit
Basically you use what ever part it calls for in the stage it’s in.
PPMs are usually read in 500 scale but there are a couple lines that give charts in 700. Like fox farm.
Sorry guys for being brief. Driving.
Me too, at one point I was running 1250 but the ppm stacking was wild! Caused all sorts of imbalances in the medium.
I’m down to full strength now with silica and they just love it!
Ahhh! Okay. I knew they had many different lines I didn’t know they had one part systems..
What I’m not understanding is that jacks claim they all perform well. Then what’s the point of multiple products for the same result? The only thing I can think of is utilization, and depending on the set up one could be more fitting.
So what ec are you running?
I have often wondered that myself… I know they recommend a water sample and then recommend the product that will help benefit your water. But still it seems like a lot of products claiming the same thing…
This is why I haven’t done a ton of research into the products or I’d be in a rabbit hole…
Full strength in RO water.
