Point-of-use household water filters (POU filters) are increasingly used to protect consumers from lead in drinking water, but there have been anecdotal reports of premature failure due to clogging when iron is present. To evaluate this concern in relation to lead removal and treatment costs, POU pitcher filters were exposed to water conditions containing lead and/or iron and tested to 100% of their rated capacity or until they clogged. Iron levels above the 0.3 mg/L Secondary Maximum Contaminant Level (SMCL) resulted in rapid clogging, affecting both treatment costs and consumer satisfaction. At 0.3 mg/L iron (Fe), half of the six POU filters tested clogged prematurely between 38% and 68% of the rated capacity. At 1.0 mg/L Fe, four out of six POU filters tested clogged prematurely, and all clogged prematurely at 20 mg/L.

中文翻译：

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铅认证的使用点投手过滤器的铁堵塞

家用净水器 (POU 过滤器) 越来越多地用于保护消费者免受饮用水中铅的影响，但有传闻称，当存在铁时，会因堵塞而过早失效。为了评估这种与铅去除和处理成本相关的问题，POU 罐式过滤器被暴露在含有铅和/或铁的水环境中，并测试到 100% 的额定容量或直到它们堵塞。高于 0.3 mg/L 次要最大污染物水平 (SMCL) 的铁含量会导致快速堵塞，从而影响处理成本和消费者满意度。在 0.3 mg/L 铁 (Fe) 下，测试的六个 POU 过滤器中有一半在额定容量的 38% 到 68% 之间过早堵塞。在 1.0 mg/L Fe 时，测试的六个 POU 过滤器中有四个过早堵塞，并且在 20 mg/L 时都过早堵塞。