Snow and poured in place rubber surfaces

Snow by itself will not damage your playground rubber surface. The way you remove the snow might though. Snow will accumulate on top of the surface until removed or melts. Poured in place surfaces are naturally porous, so water will permeate through them until it hits the base (Be it concrete, asphalt, or crushed aggregate), and hopefully that base has a pitch that allow the water to flow away and not accumulate in some spots. As a matter of fact, if you see bulges in your surface, it is more likely that not a drainage issue. 

Salting or not salting your surface? The salt itself will not damage the surface as it is melting. It is the abrasiveness of the salt coupled with foot traffic that melt. And definitely do not use a salt/sand or just sand on your surface as that will plug the pores in the rubber.

Snow in poured in place rubber surfaces

Removing snow in winter on a poured in rubber surface should only be done with a plastic shovel. (We have seen wooden shovels used before and that's done). Metal shovels can damage the surface and dislodge the granules in the wear layer. 

Poured in place rubber plough accident

We have actually received calls from clients asking us to repair poured rubber surfaces damaged by a snow plough. Snow plough have no business being near a safety surface. When that happens, entire sections of the surface might have to be replaced.