Reinhold Schuster from reinraum online had this question:
There are certainly regulations on how long you can work in a cleanroom in full gear at a stretch. But are there also guidelines or recommendations on how much and what you should drink before and after? Are there any leaflets on this? Do you provide training on this? Who can provide information here?

And here is the detailed answer from Angelika Wattrodt, PTS Training Service:

Drinking in the clean room

The topic of drinking is always a popular discussion among employees who work in cleanrooms. As far as I know, there is no specific legislation regulating break times or the entitlement to extra drinking breaks in cleanrooms. Agreements for employees are generally regulated by a company agreement. Working in a cleanroom does not justify longer break times.

Sluices and washbasins

Nevertheless, this activity is physically stressful, depending on the humidity and cleanroom class. I think it would be a good idea to install dispensers with disposable sharps cups in the airlocks that have a washbasin (up to RR class D) to make it possible to drink tap water there.

Advantages of the locks

The employees do not have to completely lock themselves out. Tap water is available and is used anyway. The spray cups can be placed in a container (with a lid) directly on site after use and disposed of regularly.

Basics about drinking

If you drink too little liquid, you damage your health. For example, the kidneys: They are responsible for transporting waste products out of the body and need fluid to do this. Other consequences of insufficient fluid intake: the blood becomes more viscous, putting a strain on the cardiovascular system. Digestion becomes sluggish.

Drawing up a drinking plan can give you an idea of how to consume the minimum requirement of 1.5 liters of fluid per day.

Possible example of a drinking plan
In the morning (before work): 1 to 2 cups of coffee or tea
In the morning (e.g. breakfast break): 1 glass of water/juice spritzer etc.
At lunchtime (lunch break): 1 cup of soup or broth, 1 glass of mineral water or juice spritzer
In the afternoon: 1 cup of coffee, 1 glass of water
In the evening: 1 to 2 cups of fruit/herbal tea, 1 glass of water

Particularly suitable are:
Tap water, mineral water, spring water and table water; tap water can be drunk in Germany without hesitation as it must meet legally defined, analytically controllable requirements.
Unsweetened fruit and herbal teas
Vegetable and fruit juices, which also provide important vitamins and minerals; fruit juices naturally contain a lot of sugar. It is therefore a good idea to dilute them with water in a ratio of 1:3 to 1:4.