We only recommend two algaecides:
1) Chlorine. Yeah, chlorine is still the best. We prefer it in bleach or liquid chlorine (same thing) because it has the least side effects to watch for.
2) Polyquat 60%. If it says "Poly...<something>..." 60% and the rest is inert ingredients, that's the stuff. Polyquat is really an algae PREVENTER, an inhibiter, not a cure.

But when you fight an algae bloom you do it with chlorine.

Start reading here and at the sister site PoolSolutions.com for any and all information.

More importantly, get your other half to read here--or let you take over the chemistry of your pool.