Step 1: Water flows from the pump into the filtration unit first, so the coarse filter (D) and fine filter (F) come right after the pump (A).
Step 2: The fertilizer tank (B) is connected after the filters, so fertigation happens on already-filtered water before it enters the pipe network.
Step 3: After fertigation the water goes into the main line (E), then branches into the lateral line (C), and finally reaches the drippers (G) at the plant base.
Step 4: This gives the order Pump - Course Filter - Fine Filter - Fertilizer Tank - Main Line - Lateral - Drippers, which is option 2.