reservoir

Hey dudes was hoping someone could shine some light on me. I want to know how can I keep my water temps down ? Without spending 600$ on a chiller for a few buckets I got going . I've heard of the frozen water bottle or ice pack idea . Any ideas guys ? Much appreciated sincerely BaKed lol

Gear Needed: 5 gallon or larger reservoir. Rubbermaid or Sterilite Commercial air pump 1/4 inch fish-tank airline Small air stones Chrome air manifold (divider) Root plugs or Rockwool Net pots Hole saw, tin snips, or utility razor knife I recommend making your own setup. Then it is made...