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I made an undercurrent rdwc system for my veg setup, I used only 25mm (1 inch) grommets. Soaked them in boiled water for a minute till it was soft af, they still went in like a bitch. Can't wait to try get my 50mm (2in) grommets in my main flower system installed. Rate I will keep the system...

Here is the undercurrent configuration fyi:

I used epoxy like 10 years ago, it never worked. Glue does not bond with polypropylene plastic which most totes are made out of. Only grommets and bulkhead fittings work. There is a learning curve with everything, esp leaks. Today I managed to get a leaky pump fittng fixed after a whole week of...

Interesting. Well I got a bottle here, Im from South Africa. Your bottle says 3% Mg and 5% S, while mine says 18.8g/l Mg and 19.4g/L S. So it maybe there is labeling law differences. MgO vs Mg: MgO = 60% Mg (from Lentech molecular weight calculator) 3% MgO * 60% = 1.8% or 18g/l....so Mg on...

Actually I have a label here which says only P and K are as Oxides (P2O5, K2O) while Ca, Mg, and S are just stated as such..

I'm running those GHE numbers but P is ppm of P, not ppm of P2O5 etc. Do you know for a fact that GHE labels all nutrient weights as an Oxide?

Hydroponics and organics are generally oil and water, but I have found they can involve each other, though they are still distinct, but kinda like a ying yang. Hydroponics needs chelates, can use organic yet inert media, bennies etc. Organics can most certainly benefit from chemistry as that's...

The metric scale was invented by the French I think, to try and make it easier to understand (believe it or not), and also to fit in-line with scientific measurement, and maybe something about revolt too. All it really is, is just a system where were multiple or divide by a 1000. Though it does...

Sorry for late reply, been building a grow room, what a distraction that is for my existing crop. Anyways, I added K2SO4 to my res now as she is nearly done (thanx for the reminder). Yeah micros is a whole other issue, why I had separete formula for dealing with them. The plant will get what...

I have slight feeling that the Hoagland solution has too much K for Cannabis. Antagonizes Ca and Mg uptake. Tomatoes apparently just need more K tho. Intresting that you running starter solution and then use a different refill solution. I read a paper by Voogt (1992), on reusing nutrient...

Intresting sounds like the Silicate acts as a alkaline buffer or is eating up your acid buffer. Most people don't know what a buffer really is. It's not just a pH downer. Sulfuric Acid drops the pH, but Phosphoric acid is a buffer system per se, so it drops the pH not too far, but it keeps it...

Are you not having problems with the silica in your stock solution? I hear various things about this

i actually havnt found one, and Im using sulfate salts for my micros except iron, which i use EDTA. I took high school chemistry and when I was 14 I read my mom's chemistry college books because I wanted to make gunpowder and rockets lol, so i learnt the language young. It's tricky i...

Because it strated out as milli-Moles because we work with a salt say MgSO4 to get our targets... we balance the chemical formula using moles, and then convert moles into mg and into ppm. Like the molar mass for 1 milli-Mole Mg is 24mg. And the per litre bit assumed, ie 1mg per litre of water...

Here's how I compute the fert salts i need for my stock solutions. Note I just use dosage rate instead of bothering with tank size and other nuisance factors. Also note I use 1 mathematical model instead of several separate and smaller steps, where I just plug in the various numbers for the...

Yeah thanx maybe one day :) Here's how I balance. 1mM means 1 milli molar unit ie 1 milli molar mass. Bit like a rubix cube puzzle, and I trust my own creative problem solving abilities over a "best fit algorithm". Let's think in terms of molarity first ie 1 milli molar mass unit per litre of...

Yeah heard that too. Would love to see the science behind those nutrients causing smells. I actually use my own equations for my nutrients mixes, should get them checked out by others. Good read thanx

No pics, maybe when lights come on i can take, but relly is typical upper leaf rust caused by calcium lockout I rate. I can use more extraction, app transpiration helps draw Calcium into the leaves. Plants are bit cramped, unfamiliar sativa strain. Was running 100:50:150 NPK on my last batch...

I started with a high P Hoagland solution at about 50% ec, then went down to N-P-K-Ca-Mg-S = 100:50:150:100:95:44:69 was fine for one strain in winter, but now another strain in summer here leaves burnt and 'praying leaf' turgur dropped Micros for both stock solutions were: Fe EDTA = 3ppm, Mn...

I'm running DWC, and I found those numbers are very hot. A few days ago I switched my bloom res down to N-P-K-Ca-Mg-S = 50-42-81-50-28-38. Still keeping P high but basically took a small fraction of the other numbers just to get my ec down.