no, i have BRS dosers. But when I set up my controller, I can hook them up to a ph monitor and regulate it that way....I am just wondering do you monitor ph or Alkalinity and Calcium levels too? I have been told that the Natureef is by far one of the best products out there, but like you said it is not your conventional 2 part system because you dose them at the same time...I am just wondering what the Natureef does to Alkalinity and Calcium...I was told it should not be used to increase either, but merely keep the levels presently in existence stable. I suppose to increase or adjust the CA and Alkalinity you would need to add calcium via a direct calcium product and add buffer, and once the target levels are hit use the two part to maintain, based upon the ph (i.e, if PH falls to say 8.15, then dos until ph is back up to 8.25)...is that about right?