This instructable will show you how to make your very own cheap and effective CO2 Reactor for a healthy, green planted aquarium.
Step 1: Materials
You will need:
A one liter gatorade bottle (or similar)
Several feet of airline tubing (vinyl is ok, but silicon is better)
An air diffuser
A suction cup to fit your tubing
A check valve
Aquarium grade silicon
A planted tank (duh?)
Step 2: STEP ONE
You want to make a hole in your bottle cap that is just a wee bit smaller than your airline tubings overall diameter. I used a pair of scissors to carve a hole, simply for the fact that I was too lazy to get out the drill, find the appropriate bit, and put it away, just for one hole. If you have more gumption than I, by all means, go ahead and drill it.
Step 3: STEP TWO
Make a slanted cut in the end of your airline tubing. This will make it easier to get in the hole on the cap.
Step 4: STEP THREE
Pull your airline tubing about 1.5" through the cap. If you are having troubles, try pulling with a pair of pliers. If you are STILL having trouble, you can shave a bit from the hole with a pair of scissors, or use a larger drill bit. Your call.
Step 5: STEP FOUR
Ok, this is the part where I messed up when I was taking the pictures. Bear with me.
About 6-10 inches away from the cap, cut the line in half, and plumb in your check valve.
MAKE SURE that the arrow is pointing AWAY from the bottle cap, otherwise you will have a ticking yeast bomb sitting under your aquarium.
The picture is of the finished project. Just pretend you don't see that part though ; )