... use the high quality carya shell is a raw material, undergoes, polishing, to steam stave washes, the medicine ... , counter-flushing intensity low (6.7L/Sm2), rate of percolation quick (24-26m/h), does not harden, ... enterprise's water treatment in the petroleum, has degree of hardness to be high, the wearability, resistant to ... approachsupplement annually %5-10 The husk filter material of walnut shells