Join Date: Jun 2008
Location: Orange County, CA
Wow, that is very creative. Previously I used an airstone to diffuse my DIY CO2 and bubbles would accumulate on the surface. This will occur unless you use a different method of diffusion or mixing. If your plants are responding and doing well, it is good enough. It may not be as efficient as other methods so you would use a lot more ingredients over time.
Are the bubbles staying at the surface for a long period of time and is the water surface moving? The longer the bubble stays at the surface, the longer CO2 has to diffuse into the water. However the water can become locally saturated, which slows the rate of diffusion. So if the water surface is moving without popping the bubbles, it will prevent local saturation. Do you have any way to measure the CO2 either directly or by PH and kH?