Lidstrom Lab French Press

French Press

Collect your equipment:

• 1- Cell cylinder
• 2- Screw valve
• 3- Piston
• 4- Cylinder cap
• 5- Spigot

Prepare the equipment:

• Check the condition of the O-rings on the piston and cylinder bottom before starting your extraction

- If they are shredded, sticky or warped you should change them

- There are 2 types of O-ring, flat and rounded; the rounded O-ring should be positioned on the outside

• Check the condition of the nylon ball housed in the screw valve

- The ball must be rounded to effectively adjust pressure

- Flattened or squared off balls should be changed out

- Use a razor blade to pry the malformed ball out of the housing and place a new ball in the opening

• Refridgerate setup at 4°C until thoroughly cold

You must have someone show you how to operate the press itself if you have never used it, but here is an overview of the press controls:

• 1- Pressure gauge
• 2- Pressure dial (increase/decrease psi)
• 3- Ratio selector (up/down)