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There are dirty things such as moisture, atomy etc. In the unprocessed atmosphere. Each cubic meter air includes 140 million solid particles approximately. After the filtration, the oil particles enter the air with the air-pressure rising, so in the compressed air there are dust, water and oil particles etc. If all of the contamination won't be cleared, it will populate, corrade the pipeline, valve, instrument, equipment consequentially. It's service life will be reduced, production cost will increase, quality won't be guaranteed.
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