The water flow through an eyewash or emergency shower should be:

The water flow through an eyewash or emergency shower should be clear because clarity is essential for effective decontamination. Clear water ensures that contaminants are not present within the water supply that could further irritate or harm an individual who has been exposed to hazardous substances.

Using clear water allows for optimal rinsing and flushing of the affected areas, particularly the eyes in the case of an eyewash and the body in the case of an emergency shower. Any impurities or colors in the water could indicate the presence of contaminants, which could exacerbate an injury rather than alleviate it. The emphasis on clear water also aligns with health and safety regulations pertaining to emergency equipment; it helps ensure that the water is suitable for the sensitive task of removing hazardous substances from the body.