Combine the starter and water in a mixing bowl.
Mix well until desired consistency is achieved.
Add all-purpose flour and mix until combined, a few minutes.
Incorporate sea salt and remaining water.
Cover, and rest for 30 minutes.
Knead dough briefly, including salt and water.
Cover, and rest for another 30 minutes.
Repeat, resting for 30 minutes each time.
After 4-5 times, rest until the dough doubles.
Transfer the dough, and cut it in half on a counter.
Shape and roll each half into squares.
Stretch and roll for tension, repeat.
Rest both halves uncovered, for 30 minutes.
Stretch and roll both halves once more.
Place loaves in baskets, and cover them with plastic.
Chill baskets in the fridge for 2 hours.
Gently place loaves in the oven, using an iron pot.
Bake at 450°F, covered, for 30 minutes.
Cool before serving.