Is the infill (the silica sand, I'm assuming) necessary when installing on cement, and is it child safe?

When installing our Playsafe Turf Rolls, you don't have to install it with infill. We recommend infill because it helps to keep the blades of the grass standing up and also helps to keep the turf looking more like natural grass. Silica sand is safe for children, but when installed properly will be very tough for a child actually to reach and eat.