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Cleaning procedure of Graded Areas

For the cleaning of cleanrooms we are using a concentrated biocide that is diluted with high purified water This water needs to be transferred into the Grade A/B. Should this be performed through a filter from our Grade C ( closest source of water to Grade A/B) or can it be autoclaved into the area in stainless steel bucket.

What is the usual practice?

Thank you

Stever.