The walnut shell filter is a downward-flowing filtration device that uses granular media to capture solid particles and oil droplets carried in the water. The walnut shell filtration medium is a suitable filter medium for filtering free oil and suspended matter. Walnut shells are a unique natural medium that is both oil-loving and oil-repellent. When ground into certain particle sizes, they become an ideal filter medium for coagulating suspended oil. It has a high elastic modulus and durability.
