The water resistance of watches is determined through laboratory pressure tests, which simulate conditions where a swimmer or diver remains stationary at specific pressure levels. However, in real-world water activities, people are rarely stationary, which affects how water resistance is experienced practically.
Surface swimming subjects wristwatches to sudden and repetitive water pressure changes. Plunging the arm into water can momentarily exceed the watch's rated static pressures. Hot tub use poses risks due to elevated water temperatures, which can compromise watch seals not designed for such heat.
Rapid temperature shifts, like moving from a hot tub (38º C) to a cold pool (21º C), can contract rubber seals, potentially allowing water ingress. As watches age, their water resistance diminishes as seals weaken and fail. Regular pressure checks annually and seal replacements every two to three years are recommended for maintaining water resistance during aquatic activities.
Showering or bathing with a watch can damage it due to hot water exposure and the abrasive nature of soap. Soap residue can accumulate in bracelet links, particularly affecting softer metals like gold and even steel over time, leading to wear and potential bracelet damage.
Here are two general tips that apply to all diving watches:
1. Ensure the crown and helium relief valve are securely screwed down to maintain water resistance.
2. Avoid using the chronograph buttons underwater as they are not designed for such use and could potentially allow water ingress.
While some watches may have this capability, it's best to avoid it as a general rule.
