About 8 months back, I purchased the Electronic CO2 Regulator from AquariumPlants.com. Instead of using a needle valve, this regulator uses an electronic valve that opens and closes in fractions of a second. You can adjust the bubbles per second, and the size of the bubbles. It’s accurate from 4 bubbles per second all the way to 1 bubble every 10 seconds. Since there’s no solenoid in this regulator, you won’t have to replace one when it overheats and fails (which is what happened to my old regulator). There’s a build in check valve, though I use two of my own (can’t be too careful), and you don’t need a bubble counter, as it has an LED that flashes to indicate bubbles.
This regulator can be used by itself, or with a pH controller. I have mine on a timer instead of a pH controller. AquariumPlants.com also has this regulator with an optional LCD 8 digit resettable counter instead of the LED. The digital counter also has a backup battery, so it won’t lose its count. They also recently started offering the counter by itself, so you can use your own regulator.
Overall, I’m very happy with this regulator. It’s super easy to setup and use. You can see how I have mine set up here. I plan on getting another one of these regulators in the future, when I get a large aquarium.
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