... unloadGood chemicals and drugs resistanceSmall resistance to fluidity,The fluid resistance is small .Strong mechanical strength,Applicable to ... qulity and change the composition of water qualityNo fade, no canker, no aging, durable, Environmental friendly ,safe and healthy, ... Test: 48 hoursenvironmental friendliness, easy to cleansing, No vibration and no noise .Durable, long time usage . Widly used ...