Tea is a “brew”. I’ve read the “cloud” is all abut tannins and junk and all you have to do is add some boiling water to your “brew” to clear it up. I’ve also heard, that like any “brew” there are bacteria in it and that can also cause cloudiness. Either way, the boiling water should clear it up and it’s safe to drink either way, although the “clouds” tend to make the tea chalky.