control ph

[adidas]

noob question here....is c02 used to control ph?

[niloc16]

inside a calcium reactor it is used to lower the ph within the reactor in order to dissolve the media.

[adidas]

can it not be used to adjust ph right in the system?

[adidas]

thinking of buying an aquarium controller, says it can control ph.

does that mean i hook up a pump to a ph buffer solution and the controller turns on pump to buffer ph if needed? or is there another way to control ph

thx