First used to soak up oil in water, new sponge sequesters excess phosphate from water Phosphate Elimination and Recovery Lightweight (PEARL) membrane, a porous nanocomposite substrate, selectively sequesters up to 99% of phosphate ions from polluted water Tunable membrane will address other environmental challenges through incorporation of specific nanomaterials New tech meets need for sustainable, scalable and cost-effective solution that works outside the lab Phosphate pollution in rivers, lakes and other waterways has reached dangerous levels, causing algae blooms that starve fish and aquatic plants of oxygen. Meanwhile, farmers worldwide are coming to terms with a dwindling reserve of phosphate fertilizers that feed half the world’s food supply.