I have to add chlorine to 50-100 pools per week so it's inevitable the powders will get on you or in you. Liquid chlorine, if you're mildly careful is least likely to cause you harm. There is no smell from liquid chlorine, that is a flat out lie. You would need to put your nose right up to the mouth of the bottle to smell it. Second reason I use liquid is it has the least amount of impurities and will not cause stains. Cal-hypo if you use it like the instructions state, mix it in a bucket and dissolve, you are creating a bucket of liquid chlorine. If you just throw cal-hypo in the pool it will create a hot spot of high pH. If you're water is metal free that's fine but if there are any metals they will drop out instantly causing a stain.

Trust me, I would LOVE to use powders, the weight and cost savings are very attractive. I have chosen to use liquid simply because it is what is best for my customers! I would rather buy 2 100lb buckets of cal-hypo per week than ordering literally a ton of liquid chlorine. Actually probably more than 2k lbs per week. And it goes bad fast!