为了利用高浊度峰值和高细菌计数的资源分配高质量的水质，小型装置必须使用可靠且易于操作的处理方法。几年来，膜过滤技术在包括法国和美国在内的许多国家被频繁使用。超滤（UF）的运行表明，通过该工艺，可以在处理厂的出水中产生低颗粒数的水。然而，这种水质变化对配水系统的影响尚未得到彻底研究。在本研究中，在超滤装置开始运行之前和之后，对两个分配系统进行了采样。在系统A中，新处理（即UF）降低了浊度、铁和锰浓度以及细菌数量。 同样，在系统B中，观察到水质快速改善。几周后，发现系统所有采样点的平均浊度降低了50%，铁浓度在30-50%范围内降低。处理厂用于消毒的氯剂量显著减少，使氯残留量稳定在0.1 mg/l左右，并保持较高的细菌水质。这些研究表明，一些参数的演化直接来自管道或沉积物。这些现象表明，即使clearwell的水质良好，也有必要调查始终会改变水质的网络。处理厂及其网络是相互依赖的物理化学和生物反应器。

In order to distribute a high-grade water quality using resources with high turbidity peaks as well as high bacterial counts, it is necessary for small units to use reliable and easy to operate treatments. For a few years, membrane filtration techniques have been used frequently in many countries including France and the US. Operations of ultrafiltration (UF) indicated that with this process, it is possible to produce at the effluent of the treatment plant a water with a low number of particles. However, the effect of such a shift of water quality in the distribution system has not been studied thoroughly. During this study, two distribution systems were sampled before and after the beginning of ultrafiltration plant operation. In system A, the new treatment (i.e. UF) reduced turbidity, iron and manganese concentrations as well as bacterial counts. Similarly, in system B, a fast improvement of water quality was observed. After a few weeks, a 50% reduction of the average turbidity on all sampling points of the system was noticed, concentrations of iron decreased in a 30-50% range. Chlorine dosage used for disinfection at the treatment plant was reduced significantly allowing a stable chlorine residual around 0.1 mg/l and maintaining a high bacterial water quality. These studies indicated that some parameters evolution are coming directly from pipes or deposits. These phenomena show that it is necessary to survey networks which always modifies water quality even with a good water quality at the clearwell. The treatment plant and its network are physicochemical and biological reactors which depend on one another.