成年丰满熟妇午夜免费视频,丁香花在线观看免费观看图片,少妇被粗大的猛烈进出视频,欧美激情视频一区二区三区免费

Life expectancy is much oxygen tube?
Jiangyin Machinery Equipment Co., Ltd. is the United States to tell you at the end of the use of stored in a dark place will extend the life of the oxygen tube. Many of our customers have continued to increase the use of tube 4-5 In yet replaced, but after a few years of use oxygen tube will gradually aging. In order to maintain the highest efficiency of aeration, we generally recommend the use of 3-4 years after the replacement of the oxygen tube. Need to refer to Continuous use of the oxygen tube to increase the service life, as many of the sewage treatment plant can be used continuously for more than five years. In addition to adding a blower filter cover to prevent contaminants from entering the oxygenTube wall, is effective to prevent clogging of the way.