自第一个工厂安装（1988年11月）以来，莱昂纳兹水都参与了6个超滤工厂的运行，其中5个位于农村环境。收集的经验表明，处理后的水具有高且非常可靠的质量。与膜设备相关的生产问题与传统设备所遇到的问题没有显著区别。与直接过滤等常规处理相比，使用超滤的采出水质量要好得多，也更可靠。 生产成本可能会翻一番。然而，当地市场条件和摊销政策对该成本有很大影响。

Since the first plant installation (November 1988), Lyonnaise des Eaux-Dumez has been involved in the running of 6 ultrafiltration plants, 5 of them being in a rural environment. The gathered experience shows that the treated water has a high and very reliable quality. Production problems related to the membrane plants are not significantly different from those encountered with a conventional plant. The quality of the produced water using ultrafiltration is far better and more reliable than when using conventional treatments like direct filtration. Production cost may be doubled. However, local market conditions and amortizement policies have a very strong influence on this cost.