Kalk in Top Off

[PoonTang]

I do it in my system. 5 gallon bucket with a Maxi 400 and a small valve.
No float switch. Using an automatic timer with 6 settings of 5 minutes each throughout the night. I adjust the valve setting to get the correct amout of top off per day, generally 1 gal. I tune the amount of Kalk/Vinegar in the bucket to match the demand of the corals.