The backwashing frequency of bio-ceramic filter is one time per week.

生物陶粒柱的反冲频率为每周一次。

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A new non-overflow dual-layer filter that is build without simultaneous overflow at time of backwashing and widely applied abroad is presented in this paper.

非溢流排水滤池是一种在反冲洗时不溢流排水的双层滤料滤池。

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At present, time period of filters are mainly used for starting up the backwashing instruction to control filter backwashing automatically in most of domestic water plants.

目前，国内大部分水厂的滤池自动反冲洗控制主要通过滤池工作的时间周期来启动反冲洗指令。

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With the extension of the running time, the pressure difference of the machine filter increases and needs to have backwashing. Have backwashing once every seven days and 15 minutes every time.

机械过滤器随着运行时间的延长，压差增加，需要进行反冲洗，七天反冲洗一次，每次15分钟。

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With the extension of the running time, the pressure difference of the machine filter increases and needs to have backwashing. Have backwashing once every seven days and 15 minutes every time.

机械过滤器随着运行时间的延长，压差增加，需要进行反冲洗，七天反冲洗一次，每次15分钟。

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