The +Pool project (pronounced ‘pluspool’), will see a public swimming pool feature on a floating island in the East River, New York. Layers of filtration membranes will make the water safe for swimming while simultaneously cleaning the surrounding river, according to project organisers, who say the pool will clean 600,000 US gallons (2,300m3) of river water every day.

The pool will be shaped like a plus sign, where its four arms will serve different purposes: a children’s pool, a sports pool, a lap pool, and a lounge pool. It will accommodate up to 300 people at a time, with a proposed daily capacity of 1,800 visitors, its developers have said.

New York Plus Pool - Inline

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Birthed in 2010, the project is a collaboration between design firm PlayLab and the co-founders of the now-defunct New York architecture...