Nutshell filter is our newly developed a new type of filter, filter shell based on the high quality thick pecan shell, suitable for the treatment of oil refining companies, with a high degree of hard, wear-resistant, compression Good, strong adsorption interception capability, etc., can be used directly in front filter backwash of oily wastewater treatment effect is remarkable. The media is not caking, non-perishable, easy regeneration and never replaced, only need to add 5-10% per year, low operating cost, easy to manage. Of oily wastewater treatment effect is remarkable, oil removal rate of 95%, oil fell 5mg / L, get rid of the EC, in addition to the good performance of the solid particles, are widely used in advanced automatic control filters, water filters and oily wastewater industrial wastewater and domestic water treatment, environmental protection equipment is the ideal filler material.