RichConley,
have the ph controller controlling my calcium reactor, very good price and has not giving me a problem in a year,
them I have the orp controller and keeping my orp level at 450 with the enaly unit, perfectly running for a bit more than a year
and on monday will be getting the reverse to have perfect desire ph on the tank,
good units at unbeatable price, you can get either for 99 at premiumaquatics, reefcentral sponsor,
sam