If you have done the Sabbactisun/Parazoryne winter prep work to insure less pathogenic organisms in your fishes' environment, you should also see that the pond is as clean as humanly possible and stretch a net across the pond to keep leaves from entering the pond.
As leaves collect on the netting, scoop them off before they become too heavy. Whereas trees provide valuable shade to koi ponds in summer, they now need vigilance to not become a nuisance in winter. Leaves are slow to break down in water. They give off tannin that discolor the water and lower pH. They provide an ideal habitat for pathogens in your otherwise clean pond. Use ML/Autumn Winter Prep and a good netting over the pond to minimize potential dangers.
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