Remove the sponge from the refrigerator about an hour before mixing the final dough so it can come closer to room temperature.
In the bowl of an electric mixer fitted with the flat beater, combine water, sponge, olive oil, and flour.
Mix on low speed until the ingredients come together into a rough, shaggy dough.
Cover and let the dough rest for 30 minutes to allow the flour to fully hydrate.
Uncover and add salt.
Mix with dough hook on medium-high until dough is smooth and cleans the bowl, about 3 minutes.
Place in a clean bowl or plastic container.
Cover, and allow to rise at room temperature for 20 minutes.
Remove dough from container and place on work bench. (If it's too sticky to work with, dust your bench with a little bit of flour.)
Turn the dough by stretching the top portion up and folding it ⅔-¾ of the way down the dough. Stretch the bottom portion up and fold it over to meet the top. Repeat stretching and folding with the right side, then the left side. Place dough back in container. Wait 20 minutes.
Repeat the stretching and folding process 2 more times at 20 minute intervals.
Leave the covered dough alone for the rest of the bulk proof. Let it rise until doubled in bulk, about another 2 hours (depending on the temperature in your kitchen). Alternatively, you could use a proofing box set to 78℉/26℃.
At this point, you can refrigerate the dough overnight to allow more flavor to develop. This is an optional step.
Turn dough out onto a lightly floured surface.
Shape and proceed with pizza recipe.