The plant with the purple blooms is water hyacinth. It does an excellent job of filtering the water, especially if given plenty of sun. I use these in my ponds each year. In the spring, I usually get an algae bloom (which is great for my baby fish), then I add some floating plants and it clears up quickly when the plants cover 1/3 to 1/2 the pond. I don't use a fountain/sprayer though. The floating plants probably won't like the surface of the water moving around much.
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