"Henry" wrote in message...
Perhaps I am missing something, but I saw nothing about pH controllers on
the link you provided. I am all set as far as regulators, needle valves
etc.
are concerned.

I am looking for information about pH controllers which will drive a
solenoid to turn the C02 stream on and off as needed to maintain a stable
given pH (which in my case will be about 7.0, which will provide me with
optimal C02 concentration).

---- Henry


While there are many good suppliers out the

You might try:

http://www.automatedaquariums.com/index.htm
http://www.automatedaquariums.com/h_981411.htm
http://www.automatedaquariums.com/h_sys.htm

Our personal experience with Milwaukee meters has not been good, perhaps it
was user error. We have had good results with Hanna, though others have
not.

Many people set their CO2 up without a doser/controller using a bubble
count/target pH method. I simply had a Pinpoint pH monitor and adjusted the
surface disturbance vs. incoming CO2 to hit our target range.

HTH