Please help...never had this problem before

[Watermom]

There is no way to know how long it will take to break down that algaecide. I wouldn't suggest adding the defoamer. Sometimes you create a vicious cycle -- adding product #2 to fix the problems caused by adding product #1, adding product #3 to fix the problems caused by adding product #2, ........

Give the chlorine time to clear it and keep your filter running. What type and size of filter do you have and what size of pump?

[PoolDoc]

Running very high chlorine levels will break the algaecide down faster . . . and help eradicate the algae you were trying to deal with in the first place.

But . . . you need to read the "Best Guess" page linked in my signature, to understand what "really high levels of chlorine" means in practice . . . and then you'll need to read the test kit info page (also in my sig) so you can actually act on that knowledge.