In a large bowl, mix flour and water until combined.
Add the active sourdough starter to the mixture.
Incorporate salt and knead the dough for about 10 minutes.
Shape the dough into a ball and place it in a lightly oiled bowl.
Cover the bowl with a damp cloth and let it rest for 30 minutes.
Refrigerate the dough for 12-24 hours for fermentation.
Remove the dough from the fridge and let it come to room temperature for 1 hour.
Preheat your oven to its highest setting (about 500°F/260°C).
Divide the dough into two equal portions and shape into pizza bases.
Add your favorite toppings and bake for 10-15 minutes until golden brown.