Water flows through them, they don't really 'absorb' water. Of course there will be moments when it freezes when there's still water in them, but it's not equiv

Water flows through them, they don't really 'absorb' water. Of course there will be moments when it freezes when there's still water in them, but it's not equivalent to freezing a sponge. The parking lot on one of my buildings is paved with blocks like this (condition for getting the building permit), works great. Never slippery in winter, either. They weren't even more expensive than alternatives.