Could Air Stones Be Doing More Harm Than Good?

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When using the O2G, the amount of H escaping during the electrolysis stage is quite low. Emitters are on only 30 minutes every 4 hours

Still water in the wild won't have sufficient DO in it to grow plants

My next grow will test some of the information stated above as my plan is to use only the emitters, no recirculation or agitation of the nutrients, though I think it would be a good idea to agitate the roots a bit. So, I have a small lpp to add if needed

FYI Im not planning on starting the O2G only grow here, but could change my mind is enough people let me know they are interestd
Just FYI these emitters break down in especially in higher salinity solutions and leech metals into the water. They also do not really super saturate the water with do like they claim. They do however increase the dwell time of bubbles so much so that a DO meter will pick them up as DO.
 
FYI Im not planning on starting the O2G only grow here, but could change my mind is enough people let me know they are interestd
I'd be interested to see how it goes if you send me a message. I think you'll definitely want some kind of agitation in the water around the roots.

Just FYI these emitters break down in especially in higher salinity solutions and leech metals into the water. They also do not really super saturate the water with do like they claim. They do however increase the dwell time of bubbles so much so that a DO meter will pick them up as DO.
I would imagine they're probably stainless steel and so, as you mention, will gradually pickle. This also happens with platinum (if you put platinum in saline at a pH of about 1 and add an oxidisers, such as persulphate or peroxide, it'll start dissolving into solution - they use that trick to recycle catalytic converters without autoclaves or aqua regia). Whether or not it's a problem is another thing I guess. I suspect you may be able to saturate the water with oxygen using relatively short bursts. Could always use magnesium for the electodes 😜

I've tried growing, temporarily, using H2O2 in solution, solely (no air pump). Peroxide has a relatively long persistence in water apparently, even at low concentrations; check this >link< where they measure the degradation. My hope was it'd help kill off any germs and also provide oxygen to the roots; it definitely does break down into free O2 when it contacts the roots as you can actually see it fizzing if you use higher concentrations. I didn't run this for long enough to know whether or not it'd work over a full grow. It did seem to keep the nutrient reasonably clean; I was running it in a clear container (exposed to light) but didn't have any algae growth in it initially.

Something I did notice, using Advanced Nutrients hard water veg, was that after adding just a few mL of peroxide every few days to 4-8L of water at ~1000ppm nutrient, I could see what appeared to be something flocking out of solution (opaque white fluff). At first I wondered if that might be the hard water additive chelating (ligand binding) minerals out of the water. But I already had some mixed up that had been sat in a bottle for weeks / months that was still perfectly transparent.

I strongly suspect what was happening was that the peroxide was actually oxidising something within the nutrient itself. Peroxide is a none specific oxidiser, so it'll oxidise anything around that can be oxidised; including organic material in the nutrient. The nutrient solution itself didn't appear to change at all in terms of ppm reading, but that could easily be because the things it's oxidising in solution aren't conductive to begin with (the ppm reading is essentially a conductivity reading right). The peroxide oxidises whatever it encounters first that it can most readily react with. One solution to that may be to add something to the tank to preferentially cause it's decomposition.

I've read many blog posts (re-posts of re-posts?) claiming H2O2 is really simple to use but I suspect I've observed something others haven't due to it being used in a transparent container to begin with (so I could actually see what was happening in the nutrient tank - the flock forming). I would be curious to know if something similar happens using the electrolysis idea, as oxygen radicals will temporarily form near the electrodes, which may then also react with the nutrient itself.
 
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Sorry, I haven't checked in THC lately

The Shire, thanks for all your input

In my minds eye, If one is using DWC, I do believe the roots do need to be tickled somewhat, especially once they get bigger. I start in a DIY bubbler now converted to O2G, once the root balls are big enough I transfer to F & D. So, I have been thinking to add the air stones in this next grow but put the pump on a separate deep cycle timer, unless I can get away with using the same timer as for the O2G. My concern being would I be dissipating the DO?

I use the drainback tube as the feed tube, but the last couple grows I was filling too high (combined with feeding too often) thereby soaking the starter cubes, which never dried out= root rot= shitty harvests. Since I have had excellent results with this setup in the past, I think I just need to adjust the volume of each flood

6 seeds cracked will be placed in rapid rooters this morning
 

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