A well maintained dive computer is one of the most reliable pieces of gear you’ll ever own. It tracks all the important data that keeps you safe underwater. But saltwater is unforgiving. If you don’t clean and store your dive computer properly after each dive, corrosion, mineral buildup, and premature wear can creep in faster than you’d expect.
A little care goes a long way. This guide walks you through exactly how to clean, dry, and store your dive computer so it stays accurate, dependable, and ready for your next adventure.
Why Post Dive Care Matters
Saltwater contains minerals that can crystallize as it dries, leading to:
• Stiff or stuck buttons
• Corrosion around metal contacts
• Fogging or damage to the screen
• Reduced battery life
• Inaccurate readings over time
Your dive computer is a precision instrument. Treat it like one, and it will last for years.
Note: This guide is intended for normal use, but if you are Polar Diving in freezing conditions then special guidelines may apply. In that case, please refer to this article for tips on Preparing for Polar Diving.
Step by Step: How to Clean Your Dive Computer After Saltwater Dives
1. Rinse Immediately in Fresh Water
As soon as you’re out of the water:
• Submerge the computer in a bucket of clean, fresh water.
• Gently swirl it to help flush out salt from crevices.
• Avoid high pressure hoses, which can force water into seals.
If your dive computer has buttons, press them several times underwater to clear salt from the mechanisms.
2. Use a Mild Soap if Needed
If you notice grime, sunscreen residue, or stubborn salt crystals:
• Add a small amount of mild dish soap to the rinse water.
• Use your fingers or a soft cloth to gently wipe the surface.
• Never use abrasive pads or harsh cleaners.
3. Soak for 20–30 Minutes
A longer soak helps dissolve salt deposits hidden around:
• Button shafts
• Charging contacts
• Strap pins
• Sensor openings - These are highly sensitive to pressure and impact, so it’s important to avoid using high-pressure water, such as hoses or jet washers, as well as compressed air or physical tools to scrape away debris. Never poke or directly touch the sensor, as this could cause damage. This is especially important after multiple dives or if the computer dried before rinsing. Follow this guide for even more information on Depth Sensor Maintenance.
4. Dry Thoroughly
After rinsing:
• Pat dry with a soft towel.
• Let it air dry completely in a shaded area.
• Avoid direct sunlight or heat sources, which can damage seals and screens.
Make sure no moisture remains around the charging port or buttons before storing or charging.
How to Store Your Dive Computer
1. Keep It in a Cool, Dry Place
Humidity and heat degrade electronics and O-rings. Store your computer:
• Indoors
• Away from sunlight
• In a gear bag or protective case
2. Avoid Storing Wet or Sealed with Moisture
Never put your dive computer into a sealed container while damp. Trapped moisture can cause:
• Mold
• Corrosion
• Fogging under the screen
Let it dry fully before packing it away.
3. Remove the Battery (If User Replaceable)
If you won’t be diving for a while:
• Remove the battery to prevent leakage. Your dives and data are securely stored on the computer, even when the battery is removed.
• Store the battery separately in a dry place.
If only storing for a short period of time:
• You can leave 1.5V Lithium batteries in the device, to keep a better estimate of remaining capacity.
• 1.5V Alkaline batteries should always be removed due to high risk of leakage.
For rechargeable models, store with a full charge to prolong battery health.
4. Protect the Screen and Buttons
Use:
• A padded case
This prevents scratches and accidental button activation during transport.
5. Check O-Rings and Seals Regularly
Even when not diving:
• Inspect O-rings for cracks or dryness.
• Apply a light coat of silicone grease if recommended by the manufacturer.
• Replace worn O-rings before your next trip.
Periodic Maintenance Tips
Every few months, or before your next dive trip, give your computer a little extra attention:
• Update firmware
• Check strap integrity
• Fully charge battery and inspect charging cables
If your computer is several years old, consider a professional service check.
Your dive computer is your underwater companion, and caring for it doesn’t have to be complicated. A rinse, dry, and smart storage habits will keep it performing flawlessly for years. Think of it as part of your post dive ritual, like logging your dive or swapping stories on the boat.
