When do you add a maintenance dose of algaecide?

[chem geek]

Polyquat is also a mild clarifier so if you are shocking to kill algae then the Polyquat can help clear the pool faster IF you have poor filtration such as with some sand filters. Of course, adding some DE to a sand filter is another way to improve filtration and if one truly wants to use a clarifier there are stronger ones one can use (such as GLB Clear Blue). In general, clarifiers are not needed.