My husband and I own a landscape company in virginia. We recently installed a $12500.00 NICOLOCK paver wall for a residential customer. Though they are "thrilled" with our workmanship, and all of their neighbors have called us for work to be done since the wall went up, they are refusing to pay the final $4500. balance due because of the efflouresence that has appeared on the pavers. We are at a loss. We have scrubbed the pavers, have had a NICOLOCK rep meet with the customer and nothing has been resolved. Any thoughts from any one would be greatly, greatly appreciated.