Many technical diving companies have, for years, used the "crushproof" oval corrugated hose made with an EPDM rubber blend raw material that has been used in diving applications for decades with excellent performance in the field. The material includes a surfactant that exhibits a gradual "blooming" of a white haze on the surface of the hose as it dries over time following manufacturing. The bloom is purely cosmetic and although harmless, if you wish, it can easily be scrubbed off with soap, water, and a cloth.