I need help! For 3 weeks I have worked on an algae infested pool. I’ve put in a bag of shock everyday pretty near everyday for the past week. And have vacuumed with the intex pool vac and the next day after letting it filter there is still algae on my pool floor and the vacuums just stir it up and only vacuums a little bit of it. Suggestions. Drain some it and shop vac it? I’ve heard of the slam method. Please explain.