开花物种很难从供水系统中根除，可能会以每毫升数千个细胞的浓度完整地通过分配管线，可能会影响成品水的适口性，并对消费者构成潜在的健康危害。在五个供水系统中，大约125个代表春季和初夏条件的样本显示，在没有游离氯残留保护的水库中，藻类的密度可能达到490000个细胞/毫升。 游离氯被发现对小球藻有强烈的杀藻作用，小球藻是所有检测系统中的主要藻类。包括32个参考文献、表格和图表。

Blooming species are difficult to eradicate from water supply systems and may pass through distribution lines intact at concentrations of several thousand cells per millilitre, possible affecting the palatability of finished water and posing potential health hazards to consumers. Approximately 125 samples representative of spring and early summer conditions in five water supply systems revealed that algae may attain densities of up to 490,000 cells/mL in reservoirs unprotected by free chlorine residuals. Free chlorine was found to be strongly algicidal to Chlorella vulgaris, the dominant alga of all systems examined. Includes 32 references, tables, figures.