I guess I should have read Jonathon's reply before I started blabbering.
Once I used a Rubbermaid container over the sump which I pearced with a hot needle for the outlet. Two or three tries to get the drip rate right. Calcium buildup was less of a problem and very easy to clean but still present. I tossed the valve idea.
Later I tossed the Kalk idea aswell.
kari
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