Don't dump more 'witches brew' junk in the pool!

Need to kill algae in the pool? Use chlorine.

Need to prevent algae in the pool? Use chlorine.

In many/most cases, all you need to do to kill the algae is to raise your FC to the appropriate shock level (based on your CYA, mostly) and KEEP IT THERE until the algae is dead. Then keep it there for another 3 days or so to make sure the algae is dead. Brushing, sweeping, or vacuuming the pool and running the filter and pump to circulate the FC to make sure the FC is able to get to any algae is helpful too.

There are some cases when other 'stuff' can be helpful in getting rid of algae, but usually all you need is time, a little effort, and enough chlorine in the pool.