esshup has the info correct. Now that a lot of the algae is windrowed up against the shore, I would remove as much as you can then treat the remaining leftovers. This results in using less algaecide. Removing FA removes the nutrients that it absorbed to grow abundantly and then it is not dead / dying /decomposing making muck and releasing nutrients on the pond bottom. The chemical killing the algae in that area is also killing the decomposing bacteria who will hopefully decay the dead stuff. Bacteria has to repopulate first then they can decompose. Firstly remove as much FA as practical then treat. Remember excess nutrient buildup in the pond is what causes the FA to grow.


aka Pond Doctor & Dr. Perca Read Pond Boss Magazine -
America's Journal of Pond Management