Jim,
There's no harm in going both the Borates and Polyquat route together. You shouldn't need to add more than a shot glass of Polyquat every week now that the problem is cleared up. At that rate a quart should last you 21 weeks--all summer. Polyquat is the ONLY algaecide we recommend. I like the stuff a lot.

You've got it fixed. It ain't broke. Why fix it?

Carl