This is called efflorescence and happens when salt is migrating out of a porous material such as your pavers. This is quite common, and we have been seeing it more and more here on long island. Some say it is the concrete that carries the salt and then once its installed weeks or months later you will start seeing this pour out of your surface. This can be resolved as long as you catch it early. Pressure needs to be used to remove this calcium but also you need to use an extraordinarily strong chemical along with it. Now not just any pressure will do you have to know how much pressure and also hot water is extremely helpful in the process and that is something power wash unlimited could help you with call us today for more information.