Yutong Fabric by The Yard and 9OZ-100% Polyester Upholstery Sewing Fabrics-Solid Grey Pattern

Is this a white grey or more of a pure grey?

Will this work for a "bean bag" chair made with course sand for use in a hot tub? Is the weave tight enough? I get chlorine will degrade it over time.

what are the dimensions of a yard?