Moe.Red said:

I would cut it in half to begin with and see how the plants respond. I have not done this grow style before so have no first hand experience.

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Have just ran a test batch on a 3L mix, 1ml of A&B per L brings it to 300/400 PPM will try that + root tonic. I will stop using the univeral traces all together.
One thing I have just noticed.. I thought I'd check my nutes. My first A&B BLOOM are a pale colour, I opened another A&B as I have bought a few from the same company. Part B on the second bottle is a much darker colour.. Maybe the B bottle on the first is actually A? So I have been adding A&A? I will email the company tomorrow to confirm..
Thanks
Treebeard

Treebeard88 said:

Have just ran a test batch on a 3L mix, 1ml of A&B per L brings it to 300/400 PPM will try that + root tonic. I will stop using the univeral traces all together.
One thing I have just noticed.. I thought I'd check my nutes. My first A&B BLOOM are a pale colour, I opened another A&B as I have bought a few from the same company. Part B on the second bottle is a much darker colour.. Maybe the B bottle on the first is actually A? So I have been adding A&A? I will email the company tomorrow to confirm..
Thanks
Treebeard

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One thing you can do to help control the root rot that may help significantly save those plants - you can use some low strength hydrogen peroxide (the stuff they sell in the brown bottle at the drug store, NOT food grade which is much, much stronger (although you can use food grade if you can't find the regular stuff, just dilute it a little))

Anyway, carefully pull the plants up out of the channels (leave them in the channel lid if it's easier) and douse the roots with the hydrogen peroxide and carefully run your fingers over the roots and massage them, get the brown gunk to wash off the roots. Then of course, clean out the channels and reservoir as well, before you add fresh water and nutes. You can do this every day if need be, but if you don't remove the mass of the root rot and just try to treat it with additives it will take a LOT longer to heal. But essentially your roots should be super white, not off-white or brown. All that brown gunk in the pics is definitely root rot as far as I can tell. So yeah, try that procedure and see how they respond.

I've tried all kinds of additives made for hydro that are supposed to cure or prevent root rot, but for some reason NFT seems to just do better if you simply run a sterile system.. I've tried Hydroguard, Great White, "Enzymes Komplete" etc. etc. with no luck.. But running a couple ml/gal of 6% sodium hypochlorite bleach in the reservoir worked WONDERS.. For me, anyway..

Treebeard88 said:

Sorry for missing your question Deadstill & thank you for such a detailed reply.

My tap water sits at 100/200 PPM - what strength would you recommend?

I am sometimes using an extra traces which is an additive so I am thinking this is where the excess iron or other micro nutrient issue is coming from along with too high PPM as my other tank doesn't show signs which is strange as their feeding schedule is similar.

I am also using a root tonic - https://www.growers-ark.com/products/root-tonic - which I am hoping will prevent root rot but I will run my fingers over them tonight & see.

Res temps - this is something I do not do, I will research your suggestions.

Light in the channels - I have weighted each corner down to prevent this but I can always tape the length so prevent further.

Great to know NFT is a hobby of yours, hopefully I can still pull from this run and have a much better one next time.

Yes the 2 largest plants have made the cubes sink in a bit so I am going to put the plastic pizza box holder underneath them to lift / raise them.

Thanks again

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As far as your tap water goes - that's not bad. Do you have city water or well water? That could make a difference. However, either way, an RO system wouldn't hurt. RO will bring it down to 0 PPM or very close to it. Here is a decent RO system I bought - it creates a significant amount of waste water, though, so keep that in mind. There are more expensive options out there that will create less wastewater, but for the price and performance, this system works great - https://www.amazon.com/gp/product/B07H2TSNZM/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1

You will just need a barrel or some type of container to collect the RO water (mine produces about 5 gallons of RO water per hour but I also have 650 ppm well water so mine works overtime)

Deadstill said:

As far as your tap water goes - that's not bad. Do you have city water or well water? That could make a difference. However, either way, an RO system wouldn't hurt. RO will bring it down to 0 PPM or very close to it. Here is a decent RO system I bought - it creates a significant amount of waste water, though, so keep that in mind. There are more expensive options out there that will create less wastewater, but for the price and performance, this system works great - https://www.amazon.com/gp/product/B07H2TSNZM/ref=ppx_yo_dt_b_asin_title_o09_s00?ie=UTF8&psc=1

You will just need a barrel or some type of container to collect the RO water (mine produces about 5 gallons of RO water per hour but I also have 650 ppm well water so mine works overtime)

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Love that filter for small grow water purification! Economical. Effective. Love it!

Most of the larger grow ops I worked at used the Hydrologic Evo 1000 with UV sterilization.

Good afternoon all,
I have attached images of each plant, are my girls ready? They are in day 68 flower!
Unfortunately after my last post we had more very hot weather for a further 4 days, but it has cooled down now and the girls seem much happier. I am guessing they have been stunted due to the heat. A frozen bottle in the res every few hour helped it seemed.
I've noticed new growth on some of the bud sites, hoping this is new flower growth after being stressed & not something else? If the pics don't show it enough for you lads I can upload some more.
Cheers
Treebeard

RootsRuler said:

Love that filter for small grow water purification! Economical. Effective. Love it!

Most of the larger grow ops I worked at used the Hydrologic Evo 1000 with UV sterilization.

Amazon.com

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I have had one of these for a number of years. But it has been quite some time since I used it. Was just checking filter replacement cost and f me to tears. If anyone else uses this and has a lead on filters at a reasonable cost please post.