Abstract
To improve ultrapure water, the additional effect of in pure water was investigated. Both formation of native oxide on the Si wafer surface and generation of viable cells in pure water can be prevented by using pure water containing on the order of parts per million instead of conventional pure water. Moreover, by using PFA or PTFE as a pipe material, pure water containing which was not contaminated by metal ions and viable cells can be fed to point of use without a circular line such as a conventional pure water feeding line.
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