I stopped using a kalk reactor when I stopped doing daily water changes
Just too much work to keep up long term. I've been using a similar concept but much smaller container:
Much easier to clean, easier to keep the food concentrated. Worked pretty good when the weather was cold, doesn't work well at all now that its 90-100F and humid every freakin day.
DFason (Dave) has been working on a chilled version:
