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Setting Up a CO2-Injected Aquarium
CO2 Tank
CO2 Regulator
Solenoid Valve
Metering Valve

CO2 & the Planted Aquarium

aquarium CO2-injection diagram

Adding CO2 to a Planted Aquarium
The illustration above shows a simplified view of the setup: 800 PSI CO2 gas passes from the CO2 tank, through a dual gauge regulator where the pressure is reduced to about 15 PSI, then to a solenoid valve that is turned on and off by the pH meter/controller, and then to a metering valve for fine control, producing about two bubbles per second in the aquarium. Components of an aquarium with CO2 injection: A Simple Experimental CO2 Generating System
Add a reservoir to the traditional yeast CO2 generator for a steadier CO2 supply to your planted aquarium. This simple system can be placed under electronic control if desired.