Now you have me wondering? My pond is 300 gallon, pump is for up to 1200
gph. Could my "green" problem be that even with the flow split in two, we
are still pushing too much too fast, and nothing has time to settle? I have
a oak barrel/skippy style and a P2 filter that will run 750 gallons a hour
both going, using a diverter. I am using quilt batting and it still comes
out of the filter green! How fine can algae be? I thought it was big stuff?
KathyAZ

Could be, algae is very fine, microscopic even. Balance is one's best bet
against it. Perhaps your filter isn't large enough, or you have too many
fish? I've got a 500 gph with a 40 gallon capacity filter that is doing
fine. ~ jan

(Do you know where your water quality is?)