I'm looking into using one... but respected reefers I follow suggest there are other approaches that are lower maintenance and that are simpler to implement. I'm sure there are many discordant views/experiences on this topic ;Wacky
If simple is dumping Kalk into ATO Reservoir or have a seperate Reservoir of Kalk then yes. Twenty years ago, I used a simple gravity drip from a jug.
However, now that I am moving back to using Kalkwasser, I want ultra low maintenance, so I decided on a gravity based Kalk reactor with a magnetic stirrer.
1. No pumps/sensors to clog. H2O is fed to the reactor which basically overflows to sump.
2. Only maintenance needed is the occasional addition of Kalkwasser (through a port) and cleaning a relatively small container every month or so.