Some type of nute deficiency?? Help!!!

Are you certain your ph meter is correct? It screams ph issue to me its the only time i had leaves that ALL looked like these from top leaf to the bottom... once i figured out my pen was gunny bags she "recovered" but harvest weight was way down..,

 

Classic ca/mg.

What kind of water are you using and what are you adding for ca/mg and how much?

Once corrected, new growth will be green.

 

So, the Brita pretty much only filters out particulates. The carbon in it depletes pretty quickly - but it's better than nothing. If there is ca/mg in your water, it wouldn't be removed by it - so that's not the issue.

Most municipalities will post their water quality analysis and you might be able to find out what your water's hardness is. If you really want to do it right - bring a water sample down to a pool store and they will test it for free. You can just say that you're curious about your water's hardness. Knowing this will help you figure out how much to supplement.

If you were using RO water, then you'd get a ca/mg additive like CaliMagic and just mix to the instructions. But, since you have SOME ca/mg in your tap water already, and we don't know how much - it'll be a bit of a guessing game as to how much to give them.

I would suggest getting a ca/mg supplement - CaliMagic has worked great for me - and start using it at 1/4 of the recommended strength for a week. Then see if the new growth looks good.

 

My meter was only off for two feedings during a dwc grow when my leaves turned almost over night so i tried to calibrate my meter reveling my new meter was junk, i now keep ph strips around although these days i grow organic...

 

It's either the pH range being off OR using filtered or RO water which has been stripped of vital micronutrients the plants need. If you're using a cheapo pH meter, toss it into the trash. You can't depend on them and you'll be better off to use the pH up/down drops kit than those. If you want one that works, spend your money and get a BlueLab. They're a little under $100 but well worth it because they work right every time. But this looks more to me like the RO water has robbed them of the micronutrients they need. Use plain tap water. We don't treat our water with chlorine in the U.S. anymore. They switched to chloramine and it will not harm your plants. We've used tap water for years with no negative effects. TWW

 

one should store your ph pen in a storage solution some contend it stays wet enough with just the cap, i calibrated my pen once every two weeks, some do it more often, do a search on how to calibrate your pen online most arethe same but some you use a small screwdriver some are auto calibrate while in a known ph calibration solution..

 

So, pH meters need a 2 point calibration. We use pH 4 and pH 7 solutions to calibrate those 2 points - the meter makes a graph of a line between those 2 points and any pH reading between them will be very accurate. below 4 and above 7 the calibration begins to drift. If you only calibrated to one point, pH 7, then your meter is only accurate at exactly pH 7. In either direction your readings will be less and less accurate.

 

Another suggestion - you can continue using the Brita, but still, I would recommend letting your water sit out for 24 hours to off gas any chlorine (assuming you don't have chloramines). The Brita will only be useful for a handful of gallons of water before the carbon in it is depleted. Any chlorine in the water can bind to your nutrients, locking them out.

 

This is not true. Most of the US still uses chlorine to purify their water. Do some research.

 

Agreed