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Algae in the pond occur because of the overabundance of nitrates and phosphates in the water. Are they usually in the open water of fallen leaves from the trees which sink and decompose on the bottom, releasing nutrients for algae, namely nitrates and phosphates. But it doesn't matter if your pond is growing a sufficient amount of fast growing plants, because they too feed on them. If still water bloomed, reach any lakes or swamps and dial a bit Raski and I assure You that after 1-2 weeks the water in the pond is crystal clear, naturally in the presence of mechanical filtration. Most importantly don't let Raski much to grow, and it will cover the entire surface of the reservoir and Your plants will be left without "food". And most importantly, whatever You do never try to move and siphon the soil at the bottom of the reservoir, raising turbidity and algae is guaranteed. After all, there is a huge amount of nitrates and phosphates.