We have the same type of pond as Uptown Girl. Ours is in the front of our house where it also gets full sunlight. We also use the puck chlorine tablets. We put the puck in a "duck" swimming pool dispenser and set it for slowest release. A puck usually lasts 3-4 weeks. After two years, water still looks clean. Occasionally, we get real ducks and other birds in the pond and the chlorine doesn't seem to bother them.
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Netherlands, California, Quebec, California, Texas, Turkey, Minnesota, Panama Canal, California, Illinois, Turkey, Maryland, Germany, Florida, New Mexico, The Village of Amelia and now The Village of Hacienda East. 
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