rubber mulch for cool rooms??

[aswaim]

ive been reading on people using rubber mulch (the type used in kids playgrounds and such) for bedding in their cool rooms or stalls.  from what I can figure out youd have a concrete pit a foot or so deep with drains in it. then youd fill it full of said rubber mulch. urine would go through it and drain then crap can be scooped and washed off and mulch can be re used once its dry. Ive found some info on calfclimate.com who distributes cooler supplies as well as the rubber mulch. Has anyone used this rubber mulch or have ideas about it? what advantages or disadvantages does provide vs. cedar fibers.