The Four-Stage Filtration Design

To meet your requirements, the machine should be designed with the following gradient:

Stage	Filter Type	Purpose
Stage 1	100 Mesh (150 Micron)	Removes large "fines," crumbs, and burnt particles.
Stage 2	300 Mesh (50 Micron)	Removes medium-sized sediment and flour particles.
Stage 3	500 Mesh (25 Micron)	Removes very fine dust and carbonized particles.
Stage 4	0.02 Micron Membrane	Ultra-Filtration: Removes bacteria, colloidal particles, and microscopic impurities to make the oil crystal clear.

2. Technical Details for 35 L/min Flow

Filtering 500 liters in 15 minutes the machine have a :

High-Pressure Vacuum Pump: A powerful vacuum (usually Water Ring or Rotary Vane type) to "pull" the thick oil through the 0.02-micron membrane.
Multi-Cartridge Housing: housing containing multiple 20-inch or 30-inch cartridges to provide enough surface area for the 100 L/min flow.
Intermediate Buffer Tank: To prevent the pump from cavitating, a small buffer tank is needed between stages.
Edible oil must be temperature on 120 degree plus

Suction By high-pressure pump (Gear Pump or Screw Pump) rather than just a vacuum.