When evaluating a BIB filling machine, prioritize filling accuracy (typically ±0.5%) to minimize product waste. You must choose between manual, semi-automatic, or fully automatic systems based on your production volume. Key components should include high-precision flow meters (magnetic or mass flow) and PLC control systems (such as Siemens or Omron) for stable operation. Ensure the machine is compatible with your specific bag sizes, ranging from 2L to 25L or even 220L drums, and check if the filling head design prevents dripping or foaming.