We are wanting to set up a Kalkwasser setup to maintain our levels; I've watched a video on how to diy the reactor/doser/container, seems easy enough, but I'd like some advice on how to diy some type of controller or monitor. Of course, we don't want the pH getting out of control, but how do you know how much per day, or drips a minute, and such that will keep all of your parameters in check? I was told by my LFS not to use one without at least a pH controller, but I do not want to spend the $$. There has to be a better way. I've seen it used as ATO, but how do you know when enough is enough? Your help is much appreciated!