Installing 4-6 aeration systems in your pond will not rid the pond of the algae. Algae is due to a nutrient problem and aeration does little to change the nutrient balance in the pond.
I could not find how big the pond is??
That system linked to on Amazon is only a single head rocking piston pump that does not produce enough air volume for a pond bigger than 0.2 ac. I think two diffusers are almost 1 too many for a single head rocking piston pump. Each diffuser does not receive enough air volume to operate efficiently.
IF you are spending the money pay the extra $$ for a dual head pump that produces twice the air volume. It will opreate 2-3 diffusers well for the larger pond(0.3ac+) application. the dual head will mix the pond faster and the pump will not need to operate 24/7 and thus it will last longer - probably double the life span. Use a window air conditioner timer - 3 prong plug. In IL run 2-3 diffusers. Run time will depend on size of the pond and how old & eutrophic the pond is.
