In our experience, Aquashade is the best of the inert blue dyes used to reduce the growth of algae and submerged pond weed. It may have to be applied several times over the course of a spring/summer, depending on the amount of rainfall and whether there is a significant outflow from the pond. It is non-toxic to wildlife; it hasn't affected our ducks, fish, turtles, frogs, etc.
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Excellent product. No cost for shipping! Been using in pond for over 20 years!
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aquashade works great
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works excellent
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Use it every year. Put it in early to stop algae build up.
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