无阀(或虹吸)滤池反冲洗一般都是自动进行的。多年来,由于没有信号装置,值班人员无法知道滤池是否冲洗了,所以生产用水的计量不准确,同时,一旦虹吸破坏有故障,造成冲洗不停,浪费水量。 Valveless (or siphon) filter backwashing is generally automated. Over the years, because there was no signal device, the on-duty personnel could not know whether the filter was flushed, so the measurement of production water was inaccurate. At the same time, if the siphon damage was faulty, the flushing did not stop and the amount of water was wasted.