Calcium Reactor, kalk reactor?? which one?

[whatcaneyedo]

Another issue you might have is kalk back syphoning into your ATO water holding reservoir. I bring this up because its a problem that I have been having and if your fresh water tanks are using the same reservior they could end up being supplemented with kalk too... I've tried adding a small check valve. It jammed open within a few weeks so I dont know what you can do to prevent this.