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DWC circulation question

agarnusa

New Member
I have been successfully growing for a few years in square 5 gall dwc buckets. I grow at 70 degrees with success and have no issues with root rot or anything as long as I don't exceed the resulting 68-70 degree water temperature. I am thinking of adding an external mag pump similar to the Current Culture setup to circulate the water. Before I do it - does anyone know if circulating the water in my system is likely to raise or lower the water temperature. Hopefully someone has already been in my situation and tried the same thing.
 

Drivejunky95

Active Member
I cant speak from experience but one way to cool water temperature is to run it outside the reservoir into a copper tubing coil with some form of direct air blowing on it.

1764396


"As mentioned before, the colder the water, the better—but roots will decrease metabolic activity below 16°C, so if you are running pure hydro, beware of that. Ideally, 18°C +/- 1°C is considered to be the sweet spot. Higher than 23°C, and you start entering root-rot danger-zone."
 

Growca2268

Well-Known Member
I initially moved to RDWC in the hopes it would drop water from 74-76F to ~70F to avoid buying a chiller, but it didn’t make any noticeable difference and I ended up buying a chiller. That said, there are other benefits that come from adding the control res - testing, exchanging soup, adding nutes, etc.. I like RDWC quite a bit and recommend you make the move, but it probably won’t do much in the way of WT.
 

CO Finest

Plant of the Month: May 2014 - Member of the Month: July 2014
With a RDWC you have the option of putting ziplock bags of ice in rez to cool water as well if a chiller is not in the budget just yet. Been there done that. Just dont make the mistake and put straight ice in unless you are on top of checking ppm and Ph a few times a day it will throw it off while melting hints the ziplock bags or could use ice packs.
 

bluenoserjoe

Well-Known Member
With a RDWC you have the option of putting ziplock bags of ice in rez to cool water as well if a chiller is not in the budget just yet. Been there done that. Just dont make the mistake and put straight ice in unless you are on top of checking ppm and Ph a few times a day it will throw it off while melting hints the ziplock bags or could use ice packs.
Interesting topic. Heres my way around it. Using the existing pump I detoured the water out of the res and through a home made chiller utilizing a two litre bottle of ice. Nothing added to res. and easy to change. Will keep res.temps ten degrees cooler then the canopy. Three bottles will work great for lights on schedule and not needed after lights out.




 

agarnusa

New Member
Can do the homemade chiller but the real one would be a noise factor. I've been shooting for a water temp of 68 because as a chemist I know that is the temperature that you get the highest level of dissolved oxygen in the water but there could be other reasons that colder is better. I'll be starting over again very soon and I think I'm going to give it a shot. Thanks everyone for all the great input - now for the design phase.
 
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