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This part of ISO 15859 specifies limits for the composition of water and establishes the sampling and test requirements applicable for the verification of the water composition. This part of ISO 15859 is applicable to only potable water and high-purity demineralized or deionized water, used for cooling and servicing of space systems as well as both flight hardware and ground servicing, system and equipment, of the following types. -- Type HP: high purity; -- Type P: potable (drinking). It is not applicable to other types of water that may be provided to a space system. This part of ISO 15859 is applicable to influents only within the specified limits herein. This part of ISO 15859 is applicable to any sampling operation required to ensure that, when the fluid enters the launch vehicle or spacecraft, the fluid composition complies with the limits provided hereafter or with any technical specification agreed to for a particular use.