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Thanks Stonehege and Pelican. Yes, I want to correct this situation, but I always jump too quickly - so your explanations help me slow down. I didn't think about the pavers being porous - and something to remove the xylene. I'm thinking to wait it out.
Funny what you said about the stone underneath. I had demolished a cement patio (20x12), but left quite a bit of the remains/gravel behind. After that, I put in a small room addition with a paver area on each side, connected by a 10ft paver walkway. The patio that hardly has the efflorescence was laid over the leftover cement patio gravel; the other patio area had new rock put in from the patio contractor. I'm not seeing any other white films around the house. Another big difference between the two patios is the amount of sun - problem patio had very little sun. I have since raised the canopy on my trees. Could it be that when the poly sand and sealer was applied the sand wasn't "set" or dry before the sealer was put on?
Or maybe if one uses poly sand and wants to seal, one should wait until the sand is entirely "set" or dry.
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