The standards established by NSF clearly state the list of contaminants, guidelines for test criteria, and the rate of contaminant removal required from a water treatment system.

• NSF订定的检测标准，除详细列出各种污染物质，亦清楚列明去除污染物测试的浓度范围、净水器应达到的去除污染率，及污染物的总去除量等。