Quote Originally Posted by chem geek View Post
A minor clarification...

PolyQuat is not only an algaecide, but is also a clarifier and was initially sold as such until the manufacturer figured out it was also a good algaecide and more profitable sold as such. It is a polymer with a net positive charge so attracts particles with a negative charge (including algae cells) and can consolidate and get caught in the filter which can then get cleaned or backwashed.

It isn't technically a flocculant which is usually something that consolidates into much larger and heavier particles that settle to the bottom of the pool if you turn off the pump and then need to vacuum to waste.
Learn something new everyday!

I had polyquat just sitting in my pool chem cabinet, would have saved me the drive to get floc.