I am having exactly the same problems. We have experienced extremely high temps and dry weather here in the south. On top of that last week our pump motor went out. We were already fighting a minor algae problem. Then going a couple of days without a pump put it over the edge I guess. We have shocked, vacuumed ...2 days later it's back. Yesterday we vacuumed and added 60% algacide. This morning it's back again. I've maintained a clear pool for about 5 years and I am totally frustrated.
Any suggestions as what to do next?