Free weed to whomever helps me solve this

Yes, seriously, if you're in Oklahoma I'll hook you up with some weed if you can help with this problem.
Double ended lights
Temp 72 - 78°F
Humidity 50- 60%
Coco/perlite mix - batch 64 golden ratio
Heavy 16 nutes - full line
Well water - running through a ro system with a ppm of around 20 coming out (I think my problem lies within the water)

So it started on the bigger plants, leave edges turning yellow/brown and dying. I checked my runoff... 4.5 ec and 6.2 ph wow!. I flushed multiple times (I chalked it up to my pops mixing nutes wrong). Got the runoff down to around 1.5 ec and started feeding again. Runoff is still good, but they are still slowly having the same problem. I thought ok.... something in the feed possibly, even though I've used heavy 16 for years. But today, I noticed this starting to happen in 2 supersoil plants that are not receiving heavy 16. Exact same thing happening to them just slowly. The only common thing is the well water. Is there something my RO system can't remove in my well? It's happening on every leaf, top, bottom, middle, etc. It starts on the oldest and moves to the newest leaves slowly. Any help is greatly appreciated. Thank you.

My first reaction was high N. but I’m not a coco expert. Maybe you need a tad more runoff to not allow the ec to rise in the medium. Maybe try more frequent waterings ?

Not seeing the telltale clawing...Looks like a potassium deficiency actually..
Google and find some snaps..

Cheers
Toad

I don't think it is acidification and, although it is cliché around here, calcium may be your solution. You said you flushed multiple times, and as @ToFarGone mentioned you may need a tad more runoff. Rather a lot more runoff, to leach out the accumulation of salts. As you wash out the salts watch your pH value decrease and the coco become more acidic. Then return to your normal inputs.

Cheers!

You ever have cal/mag issues using that line? No mention of supplementing.
Early flower Calcium use goes up. Coco will steal it from the plant if your light.
Phosphorus would be my next question.

I'm leaning towards Sulfur toxicity.

bacterial problem for the well pump consider a UV unit for sterilization? my first guess
second guess... which wouldn't make sense since it is well water, unless someone has polluted it ... is woulda been chloramine on the later plants, or a new strain with lack of calmag that you've never seen needing that much.
third guess without experience in coco, is your getting a shit batch but that wouldnt make sense eithher cause youd prolly see the issue right away if non super washd

Thanks to eveyone who posted. I've ran probably over 10,000 plants with this line without any problems so I'm not leaning towards nutrients. This is the first grow at a new facility and on well water. Possibly the bacteria from the well, that makes sense. Hopefully a test sample sent to a lab can tell me what's in it.

Probably just nute burn
Wheres my weed bitch.

Whats the ppm of the well water most well water is fine for growing and you dont need to R/O it which is a waste for well water. I suppose your just recycling it if it goes to a septic system. you ever take a clean glass and fill it with water and wait to see if you get a coat of scum float to the top or like an oil slick?? if so send a sample out to get tested.

I found that tap water tends to mess with my plants so I r/o it.
I dont thinlk you have a problem and shouldnt try to chase something that isnt there or buy some shit you dont need,

Get some microbes as well.

Have you looked at the area between the crispy part and the green part of the leaves with a scope ? Just to rule out russet or broad mites?
It looks like nute burn or a calcium issue but it being in all pots kinda pushed me to ask about pests.
you know those nutes well but have you always run them with R/O water? The super high ec also makes me think your pops mixed the nutes wrong .

Joedank said:

Have you looked at the area between the crispy part and the green part of the leaves with a scope ? Just to rule out russet or broad mites?
It looks like nute burn or a calcium issue but it being in all pots kinda pushed me to ask about pests.
you know those nutes well but have you always run them with R/O water? The super high ec also makes me think your pops mixed the nutes wrong .

Click to expand...

That's what I was thinking was the nutes got mixed wrong. But... today I noticed the same thing happening on the supersoil plants which have had only water there whole life, no nutes at all. This is what had me leaning towards well/water issues possibly.

O and no pest, 100% sure

Bernie420 said:

Probably just nute burn
Wheres my weed bitch.

Whats the ppm of the well water most well water is fine for growing and you dont need to R/O it which is a waste for well water. I suppose your just recycling it if it goes to a septic system. you ever take a clean glass and fill it with water and wait to see if you get a coat of scum float to the top or like an oil slick?? if so send a sample out to get tested.

I found that tap water tends to mess with my plants so I r/o it.
I dont thinlk you have a problem and shouldnt try to chase something that isnt there or buy some shit you dont need,

Get some microbes as well.

Click to expand...

Ppm of well water is around 800, yes 800. After the ro it's down to around 20.

Enots said:

Thanks to eveyone who posted. I've ran probably over 10,000 plants with this line without any problems so I'm not leaning towards nutrients. This is the first grow at a new facility and on well water. Possibly the bacteria from the well, that makes sense. Hopefully a test sample sent to a lab can tell me what's in it.

Click to expand...

Well water

Enots said:

Ppm of well water is around 800, yes 800. After the ro it's down to around 20.

Click to expand...

holy shit keep your weed your gunna need it.

I still think that you stay on track like you have been and just keep an eye on it. It doesnt look like a huge issue.

If you are going from well water to RO, the RO process is stripping your water of both calcium and magnesium. If you are not adding 4-5 mil’s of cal-mag per gallon of RO water, then I would say this your problem.

Are you adding cal-mag to every gallon of your RO water ?

Enots said:

Yes, seriously, if you're in Oklahoma I'll hook you up with some weed if you can help with this problem.
Double ended lights
Temp 72 - 78°F
Humidity 50- 60%
Coco/perlite mix - batch 64 golden ratio
Heavy 16 nutes - full line
Well water - running through a ro system with a ppm of around 20 coming out (I think my problem lies within the water)

So it started on the bigger plants, leave edges turning yellow/brown and dying. I checked my runoff... 4.5 ec and 6.2 ph wow!. I flushed multiple times (I chalked it up to my pops mixing nutes wrong). Got the runoff down to around 1.5 ec and started feeding again. Runoff is still good, but they are still slowly having the same problem. I thought ok.... something in the feed possibly, even though I've used heavy 16 for years. But today, I noticed this starting to happen in 2 supersoil plants that are not receiving heavy 16. Exact same thing happening to them just slowly. The only common thing is the well water. Is there something my RO system can't remove in my well? It's happening on every leaf, top, bottom, middle, etc. It starts on the oldest and moves to the newest leaves slowly. Any help is greatly appreciated. Thank you.

Click to expand...

Looks like nute burn. Certain things like manganese can be in soluble forms and these are saturated in solution and RO can not remove unless it is first precipitated out of solution and then run through filters.

I had a similar issue with well water, had to first RO it, then DI it. Before i had DI post filter i would RO it and then use and Ozone generator/stone to precipitate the manganese out of solution and then run it through a carbon filter. Was a pain in the ass but fixed the issue, then I got a DI post filter to simplify the process.

digging said:

If you are going from well water to RO, the RO process is stripping your water of both calcium and magnesium. If you are not adding 4-5 mil’s of cal-mag per gallon of RO water, then I would say this your problem.

Are you adding cal-mag to every gallon of your RO water ?

Click to expand...

I've never added cal mag with this line of nutes and never had a problem. Also it started on the supersoil plants which I've also never added cal mag to. This is what had me leaning towards the water

tooktoomuch said:

Looks like nute burn. Certain things like manganese can be in soluble forms and these are saturated in solution and RO can not remove unless it is first precipitated out of solution and then run through filters.

I had a similar issue with well water, had to first RO it, then DI it. Before i had DI post filter i would RO it and then use and Ozone generator/stone to precipitate the manganese out of solution and then run it through a carbon filter. Was a pain in the ass but fixed the issue, then I got a DI post filter to simplify the process.

Click to expand...

Can you point me in the right direction of the DI filter you use? I'm currently using the Hydrologic HL31027 pre filter first, then it goes thru the hydrologic 31023 RO filter.

i was using the evolution RO 1000 + DI that comes optional with that unit. I think you can plum the post stage DI filter from that unit into yours since they are both hydrologic. What luck.