View Full Version : My DIY CO2, Reactor and Night on/off switch

02-22-2008, 05:53 PM
Hi there,

having read a great deal and researched a great deal I built my CO2 factory, reactor and a on/off switch for when the lights are out. I don't know if that parts been done before but here they are


Ok so here comes the explanation. The CO2 Generator part is pretty standard, 2x2lt bottles I used cordial bottles I found the plastic to be stiffer than coke bottles or the like and the lids are about 2cm wider than coke bottles. That then runs into a gas separator to catch any discharge from the yeast stuff for that I used a 375ml coke bottle. All holes were drilled to the diameter of inside the tubing then cut on an angle pulled through with pliers to make air tight seals (no glue required).

Now this is where it gets different, I had read that co2 was not meant to really be used at night in the tank so decided to come up with a way to turn it off at night and have and its very successful so far. Because the co2 straight into the air would smell the house out, I use water to filter it before releasing.

1. For this chamber I used a tank gravel vacuum you will need to go to the hardware store and get a tight fitting cap and glue it to the other end of the clear tube (make sure the pointy end comes of if not you will need a second tight fitting cap but do not glue the second one.

2. Drill a hole in the pointed end cap to feed air line all the way to the bottom of the clear tube.

3. Fill with water until it is 2 inches from the top.

4. Put the cap on and you are done the open hole is the co2 gas outlet over night

Ok tubing to the tank. The tube coming out of the reactor needs to be cut and the middle part of a t piece inserted. Now cut 2 x 5cm pieces of tube push them onto the other 2 parts of the T

Now going from the t to the tank you need an airline tap and if you chose a valve but the tap goes between the t and the valve.

Now between the t and the co2 filter place another tap.

Ok when the lights are off you open the tap near the co2 filter and close the other one and in daylight vice versa

Below are some pictures. My reactor is a small powerhead and a baby bottle :-) Hope this helps some one.

Regards Darren



02-22-2008, 06:14 PM
Very interesting, thank you for sharing!