If you have concrete, it will eventually crack and break down. Itís just a matter of time. Salt will greatly accelerate this process. We can greatly slow down or eliminate this problem by applying a high-quality sealer every 2 to 3 years. Winter is a great time for this service when we have low humidity and frost free nights on occasion. Another important service is filling in the gaps on your flagstone patio every few years. This can be done with sand, pea gravel, or polymeric sand.