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can someone help me out here! the ? is do i have to turn my pressure co2 off when i am changing the water, and turn it back on after doing so ? thank you very much .:icon_mrgr
 

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Are you using a reactor or a diffuser?
 

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I have a rhino diffuser an inline DIY reactor & 2 sweetwater stones on a 120 Gal & I dont bother turning mine off on a water change.
 

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I was thinking that a reactor would be filling up with CO2 if the CO2 was left on while the canister filter or pump was not running. How much it fills up depends on several factors like bubble rate, length of time that the canister filter or pump is off, volume of reactor, etc. When the canister filter or pump is turned back on a "big burp" of CO2 might be released.

A glass diffuser would still be releasing CO2 bubbles, but it should not be a problem at all.
 
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