Well i have had the kalk top off and i went away for 2 weeks and got the notice from my wife, that the pump was blowing bubbles when i got home.
So i check to see thatthe sump was down about 35 gallons in a 55 gallon tub. so i went to the top off container and notice that the kalk hose was blocked off .
So i had to take it off what system i was using was a ro/di line going to a top off into a 26 gal tub and a hose was running from the tub to the sump gravity fed to the tank .so i had 2 top float switches .well i backed fired any way may be there is a way you can do it .i didnt work out for me
Mike