So my local pool company sold me some polyquat and said to use 6oz. weekly on my 16K gallon pool, as a preventive measure. They further said to pour the algaecide into the pool following superchlorination (I use the Boost setting weekly on my SWCG).

Tonight I actually read the instructions on the bottle of algaecide. It says to add the algaecide 8 hours after superchlorination -- rather than immediately following superchlorination, like what my local pool pro said to do.

Is there a "right" time to add algaecide? Does it matter whether I add it right after the Boost cycle (which lasts 24 hours) finishes, or should I wait 8 hours after the Boost cycle finishes (and why would it matter if I did wait)?

Thanks for the answers here.