Re:
At that strength it's quite bad.
you could probably dilute it down a lot.
Be warned, keep it cool and check on it.
Chlorine will be given off over time, so keep away from metals you like as well.
As an idea, out a drop of that in a litre of water and you have sterilising fluid. ~0.01% you have 15%
0.1% is good for cleaning up blood safely.
and bleach (domestics type) will be about 5% I think or maybe less.
And yes, great for patio cleaning, I've just done mine.