Quote Originally Posted by tinytoon
8 34 gal reses? outside of a chiller for each one ????
As tinytoon, mentioned EIGHT 34 gal reservoirs? Thats a lot. You should Try to cut that to perhaps 2 or three... especially if they are all at the same stage of flowering.
You have a couple of choices.

1. You have a chiller for each res... which is a huge expense. That is, if you have 8 reservoirs, you need 8 chillers. If you have 4, you need 4.

2. The only other way to do it, would be to make yourself a temperature exchanger. That may sound fancy, but is actually quite simple. For example you have several reservoirs you want to keep cool. Place a (say) 55 gal drum somewhere close to the reservoirs and fill it up with just plain water. Take your chiller (the bigger the better) and chill the water in the barrel to say 65F degrees. Place a SMALL pump in each res with a plastic line going to the barrel. Once its at the barrel,attach a metal coil, perhaps 3 or 4 feet long to the plastic line, since metal conducts temperatures better than plastic, into the barrel and attach another plastic line on the other end back to your reservoir. In other words, you take your 80F nutes pump them thru your plastic 1/2" tubing running thru the metal coil in the 65F water, cooling it, and then returning it back to your res. I have heard that copper is not good to use for this, but don't know for sure. Obviously you would need 8 coils in the barrel in order to leave your 8 reservoirs. Depending on the size of the chiller you will attain your temperature drop fairly easy I would start with a 200 gph pump going from each res. That means there would be approx 5 exchanges per hour of your warm nutes to the cold water. Once satisfied, you may want to insulate as much as you can, that is res, lines and water barrel.

keylime