am I mixing my kalk right??

[martym]

I just started to use Seachem Kalkwasser. The first time I mixed it, I wasn't that carefull and powder go into the air. After about 5 mins. my nose started to fill funny. The next time I mixed it I was carefull, no dust, but the same thing happened, I removed the mixture from the room and with in 10 mins things were back to normal. I put the powder in first and slowly add water to it. I gravity feed my sump. The make up water falls about 1" before hitting sump water. Does this feeling happen to anyone else, or am I mixing wrong?