Is this Calcium deficiency ?

**B.A.BARACUS** · 26-01-17, 07:27 PM

Originally Posted by muddywaters

Hi guys, a bit more info.

set up

DWC
RO water
Bagseed at 13 days from popping up.
background EC is 0.1 after nutes its 0.8. changed water at weekend.
Res temp ' 19c
Currently giving the Advanced Nutrients pH perfect 3 parter a trial.
it is keeping the pH at around 5.8/6.0 which I believe is right on the edge for calcium uptake. ??

Muddy

Advanced nutrients are only ph perfect at full strength & Calcium isn't available above 5.8.. All i'm saying is don't let the "ph perfect" bit, suck you in..

**redisiel** · 26-01-17, 07:37 PM

I'd also be concerned that my RO water is 0.1 is your ec meter reading correct or maybe is it time to change the membrane?
Hope you get your issue sorted.
Ph perfect hmm this shit makes me laugh!!!
Atb
Redz

**muddywaters** · 27-01-17, 12:51 PM

Originally Posted by B.A.BARACUS

Advanced nutrients are only ph perfect at full strength & Calcium isn't available above 5.8.. All i'm saying is don't let the "ph perfect" bit, suck you in..

Last night I decided to lower the pH to 5.6 so the plant has a chance to get some calcium.
Will be keeping a close eye on the plants for any improvement as I still think its calcium related.
The damage is appearing as blotches on the leaves at the start, before it spreads, there's no damage to the leaf tips as with nute burn.

Cheers

Muddy

**muddywaters** · 27-01-17, 01:30 PM

Originally Posted by redsiel

I'd also be concerned that my RO water is 0.1 is your ec meter reading correct or maybe is it time to change the membrane?
Hope you get your issue sorted.
Ph perfect hmm this shit makes me laugh!!!
Atb
Redz

Hi Redz, the essentials EC meter I have , after reading through the book again, apparently only checks between 0.1 to 10.0 EC.
My RO unit has a TDS monitor and final water is at 4 ppm. I think that's about 0.008 EC so not picked up by the pen.

Will take your advise re changing the membrane/ filters.

Cheers

Muddy

**iwallace** · 27-01-17, 02:53 PM

hi.
with RO water , i think you need cal mag all the time when watering, not 100% sure but someone will put you right?

**muddywaters** · 27-01-17, 05:14 PM

Originally Posted by iwallace

hi.
with RO water , i think you need cal mag all the time when watering, not 100% sure but someone will put you right?

Hi,
are you referring to growing in soil ? as I'm DWC
the nutes I am using have calcium & magnesium in them (part of the micro) and are "supposed" to be best suited for RO water according to the "blurb" which I'm starting to think is just that.

Muddy

**iwallace** · 27-01-17, 09:33 PM

hiya muddy.
im prety sure you want cal mag in RO water WITH soil, im not 100% in dwc, someone might put me right if im wrong

**muddywaters** · 05-02-17, 02:43 PM

Just an update.
Although I changed the pH of the feed to 5.6 to try get some calcium into the plant, it only got worse.
So I decided to go back to my old nutes (vitalink) Did a complete res change and now after 6 days all is looking great.
So I'll be giving the pH perfect a miss in future.

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Muddy

**joker_the_smoker** · 05-02-17, 02:58 PM

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might help you out matey. 5.8 usually sweet spot for cal/mag. with it pushin up to 6.0

**muddywaters** · 07-02-17, 06:05 PM

Originally Posted by joker_the_smoker

might help you out matey. 5.8 usually sweet spot for cal/mag. with it pushin up to 6.0

Cheers, the pH has crept up over the last day or two, as I expected with these nutes (vitalink ) as I've used before, so all looks ok at the moment.

Muddy