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We where called out to a small pond that was 100% covered with watermeal (Wolfia sp.) and duckweed (Lemna sp.). In our initial conversation with the customers, they thought the problem was an algae, until we asked "when you stick your hand in the water, does it come up with a bunch little gritty specs on it?" The answer was yes, these gritty specs are a sign of watermeal or duckweed. We offer many solutions to control watermeal and duckweed.