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Old 09-15-2006, 01:49 AM   #10
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If the bubble of CO2 builds up until it reaches where the tube is it sucks CO2 back to the inlet of the powerhead to recycle it as tiny bubbles, many of which will probably escape as CO2 mist. If the bubble gets even bigger, occupying another half inch of the big tube it burps out the burp hole. This allows DIY use with shutdown of the powerhead at night, while the CO2 keeps running, but just burps to the surface. So, DIYer will have a easy way to "shut off" the CO2 at night.
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