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NFT troughs don't have much air circulation by design. You are trying to limit the addition of water to the air in the grow area after all. They have lots of surface area but in long troughs it isn't always enough by its self. Does kinda depend on how the plants a supported and if air can...

You sure you didn't reverse the polarity? -Eskander

https://www.amazon.com/DerBlue-pressure-Anti-Drip-clogging-Nozzles，ceramic/dp/B01HYA1SBI/ref=sr_1_3?ie=UTF8&qid=1478813647&sr=8-3&keywords=anti+drip+nozzle The high pressure nozzles have much higher gate pressures than that. These are made for use at 1000psi and their minimum operation...

There are two versions of those. A low pressure gated at 65psi and a high pressure gated at 350 psi. In theory you can just change the springs out to adjust that but, It would be best to be sure you are ordering the right one. The ones that are linked are high pressure gated. -Eskander

Well, 42 gallons per week assumes you have an on time of around a second every 4 minutes back tracking from your 1/4 gallon per hour remark AND assuming that the chart is correct lol Have you measured your actual emission per hour from a single nozzle? -Eskander

Yeah... the passive heatsink thing is obviously not the way to go. Core was only a little cool with the heatsinks around 30F over ambient. I'll try again with some spare active heat sinks once I have the mounting hardware. -Eskander

You could shave that a bit by dropping to 80 PSI But that only drops you to 38.5 gallons per week from 42 gallons per week. How big is your reservoir and how often do you end up changing it? -Eskander

RH is a tool like any other. If you use it right it is useful, if you don't than it is at best merely useless. The root chamber should never get close to a RH of 70. You will start pushing the plant into senescence by letting them get that dry. For any system that is working reasonable well...

I'm probably thinking about this in too ideal of a situation but It seems that if you can find the on time that holds RH around 99% than you would be maintaining equilibrium with uptake by the roots. That would be optimizing for lowest possible water use rather than idealized growth though...

DO is relative to water temperature. Colder water holds more dissolved gas until just shy of freezing. You are right in that the DO in the water is going to be at the cap with even a small amount of aeration but delivery to the roots isn't as uniform as you'd think. The roots have a few...

Tell, you what. I actually have enough spare parts to toss together the cold finger design I'd mentioned with two 150W elements. I'll set it up this weekend and let you all know what it can manage in my cloner. It is running a little warmer than I'd like anyway. I don't think it'll be more...

Nope, when I read that I was like WTF? The lower on time at night makes sense but the "10 seconds every 20 minutes" thing doesn't. I think in the end, you just need to optimize spray duration and off time vs transpiration needs and RH in the root chamber. Keep them moist with as little run off...

It is specialized application. The point is to generate lots of small potatoes for use as seed stock. In that context it is great cause not only do you get monster plants that can put a ton of energy into making potatoes but you can harvest repeatedly unlike on plants in soil. Here is a write...

Oh, Oddjob? Yeah... we got him some meds to deal with his hat fetish and he is mostly harmless now ;) -Eskander

It occurred to me that many people here may not have a basis for comparison so here is what a mature plant usually looks like: Just in case you can't count to potato ;) -Eskander

Yes, I mean 11 feet total. They used a fusion based lighting system... -Eskander

As far as nutrients go, you pretty much need to commit to drain to waste. Nutrient uptake is around 1/3 in a single pass. There is hardly any reason to recycle what is left and there are a lot of reasons not to. You never have to screw with pH or nutrient tank top off and rebalancing but you...

I'm looking at building a seat up of my own but I'm growing chilli peppers with a longer life cycle than most people here would want. I've been doing a lot of reading on HPA and there is a ton of misinformation out there. What is worse is that there is stunningly little real literature. What...

Doesn't hurt anything to do a 1/10 or 1/100 dilution of the pH up and down in RO water. It is going to be easier to measure consistently dilute anyway. -Esander

I wouldn't ever use copper in the reservoir. Copper is highly toxic to plants and reactive enough in nutrient solution that it will corrode and leach metal into solution. Aluminum is fine as a cooling loop and is usually cheaper than copper...