Nute Burn?

[AJrexxx]

wait, whaaat? your RO water is coming out at 8+pH? That's a bad sign mate, the membrane might be toast,.. what's the ppm on the RO? pH readings on truly pure RO or DI water can be difficult to get (has to do with the way meters works and chemistry).. better measure is ppm of the RO water, which should be well under 10ppm, more like 2-5ppm,... What I chasing here is where the source of alkalinity is coming from, to make your run-off from the pot higher pH than going in! nutes acidify, BTW,...
Jingo, his problem isn't a Ca defc., and as you see, his pH appears to be above 7.0!

THe PPM on my RO is 22.

 

[AJrexxx]

The membrane is fairly new. That would suck if its toast already.

 

[Waira]

yup, you're membrane is shot AJ,... what about your meter calibration? Has that been done very recently? Even so, at 20 ppm, it's a non-significant source of buffering minerals, and the source of alkalinity remains a mystery,...

 

[Waira]

what brand is it, and is it a CTA or TFC membrane?

 

[Waira]

Ok, we're swerving all over the place here- ... have the symptoms progressed, or stopped, and is the newer growth looking OK?

 

[AJrexxx]

what brand is it, and is it a CTA or TFC membrane?

No idea my wife took the old one to the store and the guy gave here a new one.

 

[AJrexxx]

The rest of the pics.

 

[AJrexxx]

When I was getting the sample could i of put to much water in one spot and it went straight through? I probably could of spread it around more. I just checked my water my RO just phed at 9.8 and out of the faucet 9.4. That cant be right on the RO can it. Or is this an issue of me needing a better ph meter?

 

[Waira]

dude, that's about the only thing left! I've asked 3 times now AJ, have you ever calibrated it? Is it being stored in the proper solution, and not allowed to dry out? It sounds like the metere is FUBAR,... in the meantime, you can get a simple liquid pH test kit, like for aquariums, and double check things,.. again, how's the plant doing?

 

[jingo]

Do you do a two point calibration on your meter? 4 and 7 are usually best for our purposes. Do you keep your probe hydrated?

Meter is looking more and more suspect.