It might also help,too, if you can test and add the bleach more than once a day. If you add it only once a day, then it gets consumed in a short amount of time, then the algae has the rest of the day to grow in a chlorine free pool until you add again. In that case, you're fighting a losing battle, AND wasting a lot of money! In addition to the brushing and running the filter, I would check the Cl and add whatever is necessary to bring it back up to shock levels--but do this 2-3 x daily.

Janet