Always consider which way the wind is blowing. Even a very light breeze can carry fumes away, or blow them right back in your face. I carry the jug to the pool capped. Make sure I'm upwind, uncap the jug put it down so that the bottom of the container is touching the water then slowly pour a pencil sized stream into the pool. That way the distance from the jug to the water is short, causing less fumes and less chance for spatter. Should anything happen, hand slip, lose control of the container, etc. let go and back away. You'll end up having some serious pH imbalance, but at least you won't get hurt. Always have glasses or googles on whe handling MA. The higher the humidity, the stronger the fumes will be.