Geof: you are of course quite correct, the amount of algae in the water is quite low, so you have to move a lot of water. Even when you do that seperating the algae is another challange. Is gloppy stuff that almost instantly cloggs any pass through filter.
I am trying to find a scale that i can use to measure the dry weight of algae in a gallon of water. (weigh a coffee filter , run a gallon of pond water through the filter, dry and weigh, subtract the tare). Thinking of building an optical densitometer first so i can see it that works, using the weighed samples to calibrate.
greybeard: way to go , you can always just grab a handfull and have a crest sandwich.
Joe
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