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There are lots of plants in the pond, water lilies, sedges, and a type of submerged ground cover that has been the pond oxygenator through the frozen winter months. No floating algae or watermeal and lots of life like frogs, dragonflies, newts, turtles. It is a very healthy living pond.
It isn't stagnant by any stretch of the imagination. We built it 10 years ago and have monitored it closely. Believe me, Perch will not survive in a sub par pond and we have had them multiply and achieve 10-12" each year. The submerged ground cover we utilized does not impact the perch because they lay ribbons of eggs on the vegetation that is edge submerged. This is not an ornamental Koi pond.
And it is because of all the diverse life in the pond that I asked the question. I would not drink directly any surface water without filtering it first and wondered if the chickens were hardier than people in this respect.