Shell pecan shell filter media is made of high quality raw material, after crushing, polishing, steam cleaning, drug treatment, screening processed twice. This filter, high hardness, wear resistance, compressive strength, anti-pressure of 23.4kg. Chemical stability, is not dissolved in acid, pollutant adsorption capacity, adsorption rate of 27-50%, hydrophilic, anti-oil , the proportion (1.25g/cm ³ ) slightly larger than the water, filling the proportion of 0.85g/cm ³ . easy to back wash, compared with other filter media, it has the advantage of directly using the filter before the water backwash, low running costs , easy management, low-intensity backwashing (6.71cm2), filtration rate is fast (24-26m / h), the effect is good, filter is not compacted, does not rot, will never change, just add 5-10% per year can be, the effect of oily waste water treatment significantly, the oil removal rate of 95%, oil down to 5mg / l or less, the units used by this filter, the general response of the effect is remarkable, environmental protection equipment is the ideal filling material.