人们已经认识到，随着水流经配水系统，净化水的生化参数不一定是恒定的，这会导致一定程度的水质恶化。这种恶化的一个重要方面是细菌的不必要生长。为了获得生物稳定的水，可以添加消毒剂或降低可生物降解有机物（BOM）的浓度。由于异养细菌是大多数分配系统生物膜微生物种群的重要组成部分，从概念上讲，去除有机物，特别是BOM，是获得生物稳定水的一种优越方法。 本文中描述的实验室规模试验的目的是，在不同氯和氯胺残留水平下，检查不同支撑表面（基质）的异养平板计数支撑特性，包括表面和地下水。对于地表水，还评估了生物过滤对再生潜力的影响。

It has been recognized that the biochemical parameters of treated water are not necessarily constant as water moves through the distribution system, resulting in a certain degree of water quality deterioration. One important aspect of this deterioration is the unwanted growth of bacteria. In order to achieve biologically stable water, disinfectants can be added or the concentration of biodegradable organic matter (BOM) can be reduced. As heterotrophic bacteria are a significant portion of the microbial population of most distribution system biofilms, removing organic matter, specifically BOM, is conceptually a superior approach to achieving biologically stable water. The objectives of the bench-scale experiments described in this paper were to examine the heterotrophic plate count-supporting characteristics of different supporting surfaces (substrata) both for a surface and a groundwater at varying levels of chlorine and chloramine residual. For the surface water, the impact of biological filtration on regrowth potential was also assessed.