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So I pumped fluid out of a reservoir and into a aluminum reservoir from a computer liquid cooler. I slapped three peltiers on the side of that and stuck an aluminum heatsink on the opposite side of the peltiers. Then I put a 120MM cooling fan directly into the heat sink. I think a part of my...

This may have been answered somewhere but I didn't see it.. how cold can I keep my reservoir? The FAQ says to keep it below 74, due to algae and bacteria that will grow once the temps exceed 74.. but am I okay keeping my nutrients at 50 degrees or is that too cold? Is there some kind of...

This timer should be the new king. Seriously. It's fully programmable as a cycle or period timer, day selectable, uses a battery to store programming and run the clock and it's price drops under $15. http://a.co/7mU5c5s So I'm going on vacation for Thanksgiving, and I'll be leaving my new TAG...

Yeah, I set it up to work in both directions. The cooling performance was way worse than the heating performance. I was able to remove a few degrees in cooling, but I was able to heat like 20 gallons up by 60 degrees.

I'm not familiar with a fogponic grow, is your pH supposed to be that high or are you just not adjusting the pH because they're not using nutrients yet?

Ended up with a device that really was only good at heating water. Talk about disappointing.

Yeah, the price adds up quickly when you build this way.. it's unfortunately the expensive and unavoidable "product development" process. If I want to build 10 of them, I can get all the parts for about $145 a piece... right now I'm at $215 in parts. Maybe if there is enough interest I can put...

So the heat exchange will basically be the water block as the heat source, transferring heat to the peltier. The peltier will transfer its heat to a heatsink, which will then be cooled by a fan and exhausted from the unit. The math looks good as far as this design, but if I need a contingency I...

Yeah, if you click on any of the parts they all have links to amazon. You can simply click it all and add it to your cart if you want to replicate the design. I'll be posting the step-by-step "how-to" video once everything is put together and I get all the performance data validated. As far as...

Yeah, I'm only looking to take off about 4-6 degrees from the ambient temperature. I was already looking at moving it into a "insulated storage tank" like this one for only $16. Looking at that price, I don't know why I've ever bothered with anything else. The DC power supply I picked out was...

So I am looking at ways to cool my nutrient reservoir. My ideal solution would create a snap-in water temperature regulator that simply uses a temperature probe, 110VAC outlet, and a pair of hoses to connect to any system. Here's what I've got planned so far.. * Controller $38 * Elements $17 *...

If he wires up 4 COBs in parallel to that driver he's picked out, he's going to throw it in the garbage. End of story.

You don't want to use a constant current driver to wire in parallel, you want to use a constant voltage. See my discussion here

I foliar spray with compost tea for the macrobiotics, and spray with diluted phosphoric acid when I broadcast urea after their flush before flip. I mean there's certainly valid applications for foliar feeding.

So when I'm curing, I know the common knowledge is to use a mason jar and burp them, but if I can keep my tent between 50-60% humidity, couldn't I just leave them hanging in my tent to cure?

So it's funny because last week I posted about using an urea foliar spray to promote blooming, and someone was like, I thought this was an organics forum.. and I'm sitting there thinking to myself "Urea is an organic compound derived from mammalian urine. It's literally where we get the word...

Has anyone tried applying this method to yield? I can certainly throw some urea in my soil and spray some ammonia dilute on my leaves when I flip. Can I also switch back to growth fertilizers once my colas form? Could this be a key to not getting popcorn?