1.1 本规程涵盖了用于间歇使用淋浴器、水龙头和其他供水终端设备的使用终端（POU）过滤器，这些设备可提供热水和冷水。 1.2 本规程不包括串联滤波器。 1.3 单位- 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 5.1 本实践旨在模拟在一系列实际使用条件下，终端使用点过滤器所遇到的应力，重点是热波动和压力波动。A和B两部分旨在分别说明更频繁、更不极端的使用条件和更不频繁、更极端的使用条件。通过试验方法在试验前对过滤器施加预应力的目的 F838 是为了证明通过试验方法确定的过滤器保留细菌的能力 F838 暴露于一系列温度和压力波动后，代表在实际使用条件下可能遇到的温度和压力波动。 5.2 本规程的目的不是解释由于实际使用条件下可能遇到的被过滤水的质量差异对过滤器性能的影响。 5.3 这种做法的目的不是模拟与系统补救程序（如热冲击或化学冲击）相关的极端应力，有时在房屋管道系统中实施。

1.1 This practice covers terminal point-of-use (POU) filters intended for intermittent use on showers, faucets, and other water use end-point devices that deliver hot and cold potable water. 1.2 This practice does not cover in-line filters. 1.3 Units— The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 This practice has been developed to simulate the stress encountered by terminal point-of-use filters under a range of real-world use conditions with emphasis on thermal and pressure swings. Two parts, A and B, are intended to account for more frequent, less extreme use conditions and less frequent, more extreme use conditions, respectively. The purpose of pre-stressing the filters before testing by Test Method F838 is to demonstrate the ability of the filters to retain bacteria as determined by Test Method F838 after exposure to a series of temperature and pressure swings representative of those that may be encountered under actual use conditions. 5.2 This practice is not intended to account for effects on filter performance attributable to differences in the quality of the water being filtered that may be encountered under actual use conditions. 5.3 This practice is not intended to simulate the very extreme stress associated with systemic remedial procedures, such as thermal or chemical shock, sometimes implemented in premise plumbing systems.