3% in Summer, but now I'm back down to 2.80% so that the dough is still in a good window of usability when I am ready to make pizza. It's surprising how a small reduction in salt impacts the fermentation process.
I use Costco Mediterranean sea salt and completely dissolve it in the formula water as the first step in making pizza...similar to what many people do here as well.
For salting the pizza while dressing the skins, I use the Ittica d'Or or Ravida Sicilian sea salt (Trapani) from someplace like Saltworks.us --K