I prefer the darker black color over blues. I think the darker color lets less light in, so less bad growth. The blue color to too much like the Tidey Bowl effect, not natural.
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2. Dennison 6/16/2017, said:
I like black due because it looks very natural and this product works good. PS- it doesn't really turn the pond black, it just gives it a darker hue. The blue dye makes pond water look fake or not natural.