Here ya go,
I have seen several DIY chillers and they are not too hard to make.
Get a small fridge; cut two holes in it and run pump return tubing coiled in the fridge.
Another way is to get the fridge, cut the holes, then put a 5 gal bucket in the fridge part, run tubing from the bucket into the freezer part, and coil it in the freezer, put a pump into the bucket attached to the coiled tubing and the other end of the coiled tubing into the bucket, fill it with water and then run the tubing from the tank coiled into the bucket, the water gets cooled while going thru the freezer part and it continually gets cycled by the pump, then the tank water gets cooled by going into the cooled 5 gal bucket of cool water (I don’t think I have said cool enough). The reason this more difficult version is better is because a fridge that is full runs more efficiently and you can control the temp more.
Another good advantage of these chillers is it gives you a freezer to keep your food and stuff right by your tank.
I hope this is easy to understand.
