Also when you shock a green pool, usually one addition is enough to see a difference but not enough to clear it. You need to add more bleach to your pool 2-3 times daily, enough to bring the chlorine level back up to your shock level (which is why you need the test kit), until it completely clears up. Keep the filter running 24/7 during the process, also, because the chlorine will kill the algae, but the filter is what will remove it from the pool.

Janet