How long for CO2 results?

[CompMage]

Ok, I've finally gotten around to getting the CO2 installed in my 50G planted take. How long after I start seeing regular bubble movement should start to get a CO2 reading (aka PH starts to drop).

Got a dual 2L bottle setup attached to a latter that runs the bubbles for about 30 inches.

Thanks

 

[Simpte]

Could be as soon as 1hr. Could take as long as 3-4. Depends on your PH, KH, and carbonate hardness (not to be confused with alkilinity).