Desalination process

A polyurethane hydrogel for recovering less saline water from a saline water, wherein said polyurethane hydrogel is comprised of a polyol precursor and a polyisocyanate precursor, said polyol precursor is comprised of a block copolymer of A and B, wherein in said block copolymer A is from 15 to 25% by weight and B is from 75% to 65% by weight, balance in said hydrogel is said polyisocyanate precursor, and wherein said polyol precursor of A and B and said polyisocyanate has an equivalent weight from 1000 to 2000, the polyol precursor is polyfunctional and the hydrogel in a cured condition has a tensile strength of at least 3500 psi and wherein A in said block copolymer is of ethylene oxide and B is of a propylene oxide., butylene oxide, or poly tetra methylene ether.