Yo Ghan, this setup will work great. I initially pumped nute water through but it caused build up in the coils. Now the coils just sit in the Rez, the cooler (or any container) just has water, the cooling element and a small pump. You only need 5-10 gallons of water in the container. This system is extremely effective and will quickly make your Rez too cold!!! I can drop 50 gallons at 75 to 65 in about 45 minutes. Try that with an eco-shit cooler.
Any dehu off craigslist will work. One that automatically turns on when it receives power will work best and allow you to put the coil pump and dehu on a timer. The it just turns on once or twice a day and runs for 30 min a time. Bam! Fully auto, cost effective chilling with minimal BS and hoses.
A couple notes: stainless coils only! Copper will leach and kill plants. If you only have one Rez it's not an issue but I move this from Rez to Rez and found that securely strapping the dehu to the water filled cooler will prevent the copper lines from getting kinked. Be careful when bending the copper into the cooler! Grab the long parts tO make the bends, the pre-bent lines are fragile!
Lastly, the smaller the pump the better.
Please post your results. I think you will be amazed, the water comIng back from the coils in your Rez will feel like bath water compared to the icy cooler water. It just sucks the heat right out of the rez!!
Disclaimer: all this info is false and this is by now means the cheapest and fastest way to cool your Rez. Please feel free to be a dick for the sake of just being a dick cause that just proves to me that your meds are schwag.