Walnut shell filters bring remarkable improvements to filtration technology that no other technology can bring into the question of water filtration nowadays. 1. Walnut shell filters remove more than 98% of oil contaminants and suspended solids from the water. 2. Even though walnut shell filter is specifically suited for purifying water, it also has applications in the petrochemical, metal-working and power generation industries. 3. Walnut shell media do not affect mud properties crucially and it can be removed, perhaps recycled easily.