If you are creating this paver patio
from concrete pavers, chances are you are noticing a byproduct of concrete called effloresence. If they are brick then it could effloresence being released from the concrete under the brick. I would use an effloresence cleaner first and if that doesn't work you might try muratic acid, just be sure to do a small test area first.
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Last edited by bigeyes; 10-26-2009 at 01:16 PM.