管道过滤器在运行过程中必须定期停车清洗、排污，往往影响系统设备长周期运行。
The pipe filter must be shut down for cleaning and drainage regularly during its operation, and this usually interferes with the long-period operation of the equipment in the system.
混凝土涵洞，雨水沟，排污沟系统的最低成本(使用周期)的标准规范。
Standard Practice for Least Cost (Life Cycle) Analysis of Concrete Culvert, Storm Sewer, and Sanitary Sewer Systems.
混凝土涵洞，雨水沟，排污沟系统的最低成本(使用周期)的标准规范。
Standard Practice for Least Cost (Life Cycle) Analysis of Concrete Culvert, Storm Sewer, and Sanitary Sewer Systems.
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