Wow, those are pricey. Somewhere on the internet, someone posted how to make a water chiller using a small refrigerator. If you let a breeze from a fan hit the top of your reservoir, it can change your temps about 10 degrees cooler. I tried it and it works.

I thought the optimal temperature is 78 degrees. What has been your observation with temperature? I'm doing my first hydro grow.
Gen Reviewed by Gen on . Nutrient Temps- practical solutions Ive been looking at these chillers: http://www.marinedepot.com/aquarium_chillers__index.asp?CartId= They seem too large for my application (20-40 gallons). I've found a temp of 65 F to be best, but changing the ice every day is somewhat tedious. Has anyone found suitable products, or found different optimal temps. thanks. -green4life:thumbsup: Rating: 5