Natural Leavened Plain Loaf

Thanks to someone from the baking group in sharing the recipe but I can't recall who.
Following are adapted from her sourdough loaf. I managed to get 2 loaves out of this recipe. 

Bread Flour 390g
Salt 6g
Apple Starter 100g
Cold Water 210g

1. Mix water and starter, add flour. Let it autolyse for 30 mins.
2. Mix in salt. Combine well.
3. Do 4 rounds of S&F, 30 mins resting time.
4. Shape and bulk proof for 2.5hrs.
5. Divide and shape for final proofing for 2 hrs.
6. Bake in cast iron pot at 250'C for 40-45mins.