Product Introduction: Features: 1. This product uses specially processed walnut shells as the filtration medium, offering strong adsorption capacity. The filter material can be backwashed and regenerated, has high compressive strength (23.4 kgf/cm2), stable chemical properties, and high hardness. 2. It exhibits excellent wear resistance, requires no replacement during long-term use, has strong adsorption and contaminant retention capabilities (adsorption rate: 25–53%), good hydrophilicity, and oil resistance. 3. Backwashing is performed directly using pre-filtered water, eliminating the need for air sources or chemical agents, resulting in low operating costs. Depending on water quality requirements, it can be used in single-stage or dual-stage series configurations. Model Specifications: Filter Material Name: Quartz Sand / Walnut Shell Filtration Efficiency: - Oil-Water Removal Rate (%): 40–50 / 82–93 - Suspended Solids Removal Rate (%): 50–65 / 85–96 Filtration Rate (m/h): 8–12 / 25–30 Backwashing Intensity (l/s·m2): 16 / 6–7 Filter Material Maintenance: Replacement every 2–3 years / Annual replenishment of 10% Suitable for oily wastewater treatment in oilfields and various other industries.