At a salt level of 2000 ppm, you won't see any damage to concrete, especially where you live. The problems associated with salt deteriorating soft stone or concrete surfaces is where there is splash out onto the pool deck or coping that does not get rinsed for long periods. A decent rain shower or quick rinse of the pool deck on occasion is enough to prevent problems, especially at that low of a salt concentration. Most pools with SWCG are about 3500 ppm, not much higher than the 2000 that you want to try. Relatively speaking, it's not a lot of salt considering that sea/ocean water is in the neighborhood of 35,000 ppm.