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What was the height of your waterlevel again? And did the root mass also reach that height, laying flat?

I always was a bit surprised how dense and flat your roots were. Comparing them to DWC for example when they sometimes fill up the whole tote.

If he added Silica in some way, I guess his pH would be high from the start.

Indeed, Cinco: A pump in a rez for E&F is only necessary to mix your nutes. Never needed for getting O2 in your water. There is plenty of O2 available for the roots once the water drains. (and also there will be some DO in the water anyway)

I don't know what is causing it. There can be many reasons. But I do know that using air stones creates carbonic acid as CO2 in the air bubbles reacts with your water. This can influence the pH. So why not get rid of them, as the serve no purpose anyway?

Get rid of the airstone. No need for that at all. E&F does not need aeration. And if you do 6 feedings a day your nutes will probably mixed enough, so no need for a waterpump or something like that as well.

I saw this chart and if you see the high numbers of K compared to P. Quite amazing.

Indeed the K number is high They also have another product (Orange) that has about the same number, and then the K is 36. Peters fertizilizer for tomatoes and also Masterblend for tomatoes have number like 4-18-38. Masterblend Hydro, Jack's and MegaCrop 2 part have numbers around 5-11-26. Why...

Greenleafs wrote me that they will have the 2 part MegaCrop available in Europe in about 5 or 6 weeks from now. So that should be end of September.

The numbers of Jack's, Masterblend and Megracrop are almost identical for the A-part: 5-12-26/ The B-part of those brands as well: 15.5-0-0. But only Jack's and Masterblend also advice to add a C-part: Epsom Salt. Why do you think MegaCrop is not doing that? Is t not needed, because there is...

$ 17.00 for a bag of 25 kg (55 lbs) where I live.

Fun facts: Most companies that sell a 2 or 3 part like Jack's and MegaCrop have a product like Calcinit (15.5-0-0) They probably buy it from Yara and repack it. Megacrop sells it for $ 1.70 per lbs. Jack's you can buy for $ 1.30 per lbs. Jack's number is 15-0-0 instead of 15.5-0-0. Yara is about...

Thanks, gonna take a closer look in what you wrote. I have to admit that is sometimes way above my head. Yara is a huge company in fertilizers. They have a turnover of more then 13 billion dollars a year.

Seems they ran out of most products.

You make all the wonderful charts and comparisons. Some people I know use a product by Yara. https://www.yara.ie/crop-nutrition/fertiliser/soluble/yaratera-kristalon-brown/ Together with Yara Calcinit (15.5-0-0) They use 2 parts Calcinit to 3 parts Yara Brown in bloom. What are your...

Then do 4ml/micro, 8ml/bloom and a 1/4 tsp calmag if you want a lower EC. Or do I misunderstand the problem?

My source of info is people who grow under led. And the temperature is lower than air temperature of course. With HPS it is already 1 or 2 degrees lower, and that is with a light source that gives a lot of radiant heat. Radiant heat, heats up surfaces (like leaves) not the air directly. LED does...

I sometimes miss things because English is not my first language.

If money were an issue, some people might think about not getting the RH that low. Someone above mentions "I bought one on Amazon for 30 bucks and it keeps it down to 35-45% perfect for flowering" Those numbers would only be good when your room temperature is not that high. Below 24 C / 75 F.