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The Salt Trap: Where Rinsing Fails

ByRob Hancock

We’ve all been told since Open Water Day One: “Rinse your gear in fresh water after every dive.” It’s the golden rule of scuba. But as a technician who spends my days looking at the “guts” of regulators, I have a confession to make:

Your post-dive rinse isn’t doing as much as you think it is.

Fresh water is great for surface salt, but it’s a poor cleaner for the places that actually matter. When salt water gets into tight tolerances and evaporates, it leaves behind abrasive crystals that don’t just “wash away” with a quick dunk in a smelly rinse tank at the marina.

If you want to avoid preventable equipment repairs on your next service, you need to watch out for Salt Traps.

1. The Hose Protector “Incubator”

Hose protectors are the favorite hiding spot for salt. Water gets trapped between the rubber sleeve and the hose fitting. As the water evaporates, the salt stays behind, concentrating into a hard, white crust.

  • The Damage: This hidden salt causes “crevice corrosion” on the metal fittings and dries out the hose material, leading to those cracks we call “snake skin.”
  • The Pro Move: During your rinse, slide those protectors back. If they won’t budge, they are already salt-locked. Don’t force them—bring them to the shop.

2. The BCD Power Inflator (The “Sticky” Culprit)

Most divers rinse the outside of their BCD, but the salt that kills your gear is on the inside. Every time you orally inflate your BCD or salt water migrates through the dump valves, crystals form inside the bladder and, more importantly, inside the inflator mechanism.

  • The Damage: Salt crystals act like sandpaper on the internal O-rings of your power inflator. This is how you end up with a “sticky button” that keeps inflating your BCD when you don’t want it to.
  • The Pro Move: Fill the BCD one-third full with fresh water through the mouthpiece, shake it thoroughly, and drain it through the inflator hose while holding the oral inflate button down. This flushes the internal valve path.

3. The SPG Swivel

The junction where your high-pressure hose meets your gauge is a swivel point. It’s designed to move, which means there’s a gap. Salt enters that gap, dries, and turns into a literal wedge.

  • The Damage: Once that swivel is locked with salt, any movement of the gauge puts torque directly on the tiny HP spool O-rings. That’s why your gauge starts leaking right as you’re gearing up for a night dive.
  • The Pro Move: While rinsing, rotate the gauge gently under a stream of warm (not hot) water to ensure the salt isn’t allowed to “set” like concrete.

The Specialist’s Perspective

A rinse tank is a courtesy; a thorough home cleaning is an investment. If you dive in salt, the goal isn’t just to get the gear wet—it’s to dissolve the solids.

Remember: If your gear hasn’t been deep-cleaned or professionally serviced in over a year, you aren’t just diving with a regulator; you’re diving with a chemistry project.