I stopped buying them. Many times there was a strong chlorine taste, maybe not flushing out after cleaning, and then several times picked a bottle up, and it was leaking around the cap. In my mind if water can get out, germs can get in. Fitted a filter system instead, maybe a little more expensive, but what price peace of mind. As for JB300 situation, it may be worth taking a look at the storage tanks on the roof of the condo, and talk with maintenance on their routines, if any?