Relax, especially the one with the negative review. I had a bad block and Revain was quick to replace it. Thank you Prime for the quick replacement and fast shipping. I use a homemade CO2 generator. Sugar + yeast, 2 liter soda bottles, you'll find heaps of treatments if you search "DIY CO2". So it doesn't generate a lot of psi, but enough to drive fine mist out of that ceramic diffuser. I kept the valve closed at night and my pressure rose to around 1.5 (up to 2) kg/cm2 which is 20/25 psi. As soon as I opened the valve the pressure dropped due to the release of CO2 into the bubbler bottle. I have 2 bubbles per second and you have millions or a fine mist of bubbles. This is how we want to keep the aquarium green. I have a filter outlet at the same level that mixes this mist with water, secondary circulation. My homemade CO2 lasts 2.5 to 3 weeks. So patience, it works!
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