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So you know how to inject CO2 but aren't quite sure how to get it to dissolve in the water? Well your at the right page. Below is a cheap DIY reactor that does the job great for a small price compared to commercial reactors.(Thanx to Dr. Jay for all the info)
1. Take the gravel cleaning kit and cut the flexible tube leaving only 1 1/2 in. above the sturdy tube.
2. Drill a hole into the sturdy tube roughly 2-3" below the top.
3. Insert the Foam in the bottom of the tube.
4. Connect the pump to the tube, insert the CO2 supply, place in tank and plug in. That's it!