I keep it in a 20 gallon tote, lid on. I run it clear once a week.

I remember ping telling me about that. I've suffered no I'll effects in the last year or so. I find that kalk is a very forgiving substance to deal with. When the mood strikes, if my top off is clearing, I mix a spoonful into a bottle and shake, then straight into the sump. Around 3-4am. You can almost see the coral growing pale at the tips the next day.