The silver is a really unique color. I loved it but it didn't mesh with the style of our home and yard. I've heard mixed guidance on pressure washing. Some say it's ok at an angle on low and others suggest nothing stronger than a garden hose. Since ours is still new I've only used a garden hose and scrub brush in hopes of keeping the base sand from eroding. The stone is certainly more sensitive and porous than cement pavers so consider sealing (if you like the look) or expect to clean frequently with a cleaner like DuPont StoneTech.
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