>For (2), I look at it this way: A swimming pool can be 99% pure water, but if it's 1% poop I don't want to dip my feet in it. Not sure how much you swim but

>For (2), I look at it this way: A swimming pool can be 99% pure water, but if it's 1% poop I don't want to dip my feet in it. Not sure how much you swim but 7.14*10^-6% of every swimming pool is per, atleast.